I hope someone can help me. I have a 1978 olds cutlass. It originally had 3.8 v6 in it,but I put a 1974 350 rocket in it. The headers I bought seem to have some clearence problems.I ordered a set of flow tech pn 11150.Are these the correct headers for this model cutlass? It has a column shift auto trans.  

Try www.summitracing.com I think the part number should be BIG-11152FLT.The headers you have is for 1968-77cutlass  

google frame dimention charts ... there is a guy selling them on ebay.. then measure between the upper control arm mounting brakets...  some times the frames on higher milage cars collapses and the rails get closer toghter... and that causes the headers to not fit... ... i posted  a thread.. a,b,f,x frame fixes last week on one of the mags.,  probably superchevy..  check it out...

http://forums.superchevy.com/70/6511905/general/a-b-f-x-bodys-that-wont-align/index.html