John
The engine you have would be just fine for a daily driver,
if your not racing there is realy no need for
4bolt main
also if you go with later vortech you are going to need computer and related wiring for EFI
If you rebuilt your moter with 9.1 compression
mild cam HEI distributer and a good qatrajet carb throw in some sort of overdrive transmishion
and with a littel fine tuning 15mpg shouldent be hard to acheive
