283 to 350 swap question

I recently got a 1964 gmc stepside with a 283 motor in it and i was wondering if i could put a 350 bigblock in it. What mods would i have to do or if it is even possiable. all input will be appreciated  

"350 bigblock?"  

If we're talking SBCs, the exterior of the "Mouse" blocks are all the same size.  Other "orphan" GM 350s were bigger.   But I don't know if I'd call any GM 350 a "bigblock" except for perhaps the antique Chevrolet 348 or maybe the real Pontiac 350 (which was really kind of a "midblock").

Swapping a Gen I SBCs for a larger Gen I SBC is pretty much a bolt-together deal.  
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460_BBF_Turbo-in-CC (formerly Dr511scj) "This guy has no life other than posting endlessly on carcraft.com." -- Car Craft, July 2005
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October 1, 2003: " I'm thinking a couple of...turbos, blowing through an old Powerstroke intercooler...on a Super Cobra Jet-head 460 would be mad cheap and make sick power."
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"I have no problem with your...talking to several versions of yourself...or pointing out our failure to do a turbo story ...." --Douglas "CC/Rambler" Glad

So is it possiable? do i have to weld new mounts?  

(Apparently Jeff "SBC" Smith's work is not done)

http://www.classicparts.com/Motor-Mounts/products/228/

http://www.novak-adapt.com/knowledge/chevy_standard_shift_info.htm

http://www.parts123.com/PartFrame.asp?ZTM=cadegekc&GHOME=www.gspp.com&TITLE=

You believers in the Small Block Chevy religion ought to step up and help this brother out . . . .  
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460_BBF_Turbo-in-CC (formerly Dr511scj) "This guy has no life other than posting endlessly on carcraft.com." -- Car Craft, July 2005
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October 1, 2003: " I'm thinking a couple of...turbos, blowing through an old Powerstroke intercooler...on a Super Cobra Jet-head 460 would be mad cheap and make sick power."
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"I have no problem with your...talking to several versions of yourself...or pointing out our failure to do a turbo story ...." --Douglas "CC/Rambler" Glad

If it is a small block chevy 350 then there is absolutely nothing you have to change out on the truck.  It will bolt right in, same dimensions and mounting points.  Might have to do some research on Fly Wheel's if you are using a one piece rear main seal 350 block.  All the accessory brackets should bolt on going from newer block to older vehicle.  Can't guarentee all the drive train parts will live behind a significantly higher Horsepower engine, but it will bolt together.  
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The Silver Buick- '77 Skylark coupe w/ a Fuel Injected Buick 455&TKO-600, '72 Centurion Conv't - 455w/TH400, '67 T-bird 4Dr (suicide) w/428&C6. Needing to replace a '69 Firebird 400.

http://www.bangshift.com/forum/index.php?topic=6189.0

will a 2speed powerglide bolt up to that 350?  

The powerglide transmission will bolt to your 350 Chevy engine, as long as the bell housing on the transmission was origanally drilled to fit a SBC engne. If you have one off of anothe marquis block, i.e. BOP engines, the bolt pattern is different. I woud recommend a THM-400 since youi aqre using a truck. It is a stronger transmission, they are fairly plentiful. If you cannot find one, go with the THM-350. It is a reliable tranny as well. You'll have 3 gears, which will give you a little better low-end takeoff. You'll see a slight improvement in you economy as well.

Or is this a drag truck, where consistency is needed? If you're dragging it, use the powerglide. You only shift one time, therefore you're vehicle will have better consistency at the track.  
Guzzling gas and hauling ass, the true American way.

do you mean a 366 big block?