IF you go with the 250/T-5 I assume you will be installing a trans tail shaft mount/cross member as well and doing away with the bell housing mounts?
The 283 would be an easy swap...put the V8 mounts on the front cross member (available from all the vendors), find a TF V8 bell housing to retain the side mounts and get the V8 throttle linkage. That's about it...
Mike B
