Re: FE engine blocks
Have you looked into a FT 391 block? Same dimensions as a FE 390 (same bellhousing, engine mounts, accessories) but with stronger oiling system and a hole drilled into the side for extra oil drain back. All are made of stronger iron and most have extra webs and ribs for the crank.
They came in medium and heavy trucks but not sure how many were made.
When you're going through hell, keep going.
Putts drives a 1965 four door Galaxie. Rebuilt 390. 4100 on a Performer, AC, PS, PB w scarebird front discs, COM MX transm w/3.0 R.E. The seats, dash and hood are customized.