I have a 64 rambler american, and i've been told any AMC V8 will drop right in to it, without changing any mounts or frames. im sure someone here has experience with this, can anyone help? if so, please give me further info on it.  

Peruse the links on this page, you may find someone who can help you.

http://www.science.uwaterloo.ca/~afleming/  

Peruse the links on this page, you may find someone who can help you.

http://www.science.uwaterloo.ca/~afleming/  

All you need to do is go back and read the article on building the Rambler here on the CC website. All 64-69 Americans are the same chassis. Exterior sheetmetal changed in 66, but that's about it (with a few exceptions that won't affect an engine swap). A 64 American would have had a 195.6 flat-head or OHV six. That crossmember has no "perches" for the engine mounts. You can make your own perches or get a 66-69 American or Rogue, or 70-79 Gremlin/Hornet/Spirit/Concord V-8 crossmember. Another bolt-in alternative is to get a 199/232/258 six crossmember and buy a set of conversion mounts from Bulltear (www.bulltear.com). They are made to bolt to the AMC V-8 then directly to the bigger six crossmember (which has perches on it). That's the easiest way to go, as six cylinder crossmembers are easy to find, the V-8 crossmembers are rather rare. Doug Galvin (www.ramblerparts.com) also sells ready to go V-8 crossmembers (modified six cyl. CMs). One word of warning -- if you use a V-8 CM you'll have to have small car (American/Hornet/etc.) engine plates. Big car (including Javelin) plates are too tall and won't work in the smaller cars. Galvin has repros of those also.

Personally, I'd make perches for the 196 CM, with a second choice of using a six CM and Bulltear mounts. I'd only use the V-8 CM and plates if I had ready access to one in a salvage yard or really wanted to duplicate a factory installation. No factory V-8s in 64-65 Americans, the older big V-8 would have been a tight fit (AMC came out with a new, more compact V-8 in mid 66).