65 Chev Long bed (8') BBC ???????????

[Dgas56]

I found a 65 Chevy 1/2T PU, 250 six, 3spd column stick. Dirt cheap w a title. NICE complete barn truck just pulled out this last spring (In the pic ,what is not shown on the truck is inside), unmolested in orig paint. BEFORE I buy it I want to check into a few things like a BBC/Auto swap, LOW budget dropping. Aftermarket springs Ok. I am told 4" back 3" front is about the limit on springs only dropping, BUT no flip kits or aftermarket spindles right now. (I spent most of what I had on the BBC and tranny)
I am looking for buget back yard swap info on the BBC ,disc brakes + later posi (Either 5 or 6 lug doesn't matter to me)
so here is what I need to know
1. The swap-mounts ??
2. Headers or manifolds ?? Which headers?? or will manifolds work?? (it is not a super HP motor)
3. Which JY discs fit ??
4. Which RE works ?? spring pad relocating is OK,I have them. I am guessing that it has coil springs in back tho

Experiences? Anyone feel like doing a paper build? I am out of usual area here.