Re: Engine swap advice
If you find a 9 inch rear from 67-70 it's a bolt in, 289-302 with a C4 is a bolt in with the correct parts, as is any FE with a C6. Of course you need the correct parts and the list is long
For the front end, any 67-70 5 bolt lug Mustang from the spindles will work, or find Granada disk spindles with a change to tie rod ends.
In the end, not a real tough swap, but takes some parts searching and rebuilding.The 289/302 swap would be the cheapest by far, and despite being a big block guy myself, likely the easiest and cost effective way to build a real fast car if that's the goal.
70 Sportsroof, 427 FE/489 cid, TKO-600, 31 spline 4.10, A/C. modified Mass-flo EFI/reprogrammed A9L/CnC ported Victor.