You can put a (1) piece rear main ie 1987 sbc in front of a 800 Stringer!
This is how I did it . . . You will need an engine coupler for a ford 302/351 and the (six)bolts.
The crank on the SB Ford and 1987 and later SB Chevy are on 3 inch diaiameter bolt circle. Note that
5 out of 6 bolt holes...