OK, I haven't landed the bigger T5 (4.3L/V8) but I do have a line on a cheap ($50) 2.8L one. My question is if I use the 2.8L for mock up, will I have a ton of things to change for the bigger one when I get it? Are they pretty much the same dimensionally? There is a method to my madness, once I'm done I'll use the 2.8L T5 in my 54 Bel Air with the stock 235. If so, I'll go for the correct bell housing and such to get the truck together and mounts made THEN I'll get the right one and swap them.