I say try and get everything you can. I'm not sure where the engine harness connects to the in cab harness, but I would look at wiring diagrams and get any and all body control modules, security modules, and maybe even the fuse block (I beleive theres one inthe engine compartment) This fuse block usually as fuses for the engine sensors. I also don't know, but you might be able to get the computer reprogramed to get rid of things like VATS. I can't help with the mounts, I got mine from advanved adapters, they might make some for this conversion. Probably do since this could go in any 350 conversion. If you can get the a.c. ten get it, if you don't use it, sell it on ebay!!! Hope this helps