Re: SBC vs BBC mpg
IF a GearVendors or a 4L80 could double gas mileage (big IF I'm sure) and I allowed $3000 in budget for either unit, how many years would I have to drive it to break even? Too many of us get jacked up on the latest Slick Magazine engine, tranny, go-fast, corner better, brake quicker, please others gizmo that we fail to enjoy however things are at the moment.
How many miles a year do most of us put on our cars anyway?
I'd say build what you want, drive it all you want, spend the $$ on gas---and at the end of life (yours or the car) you'll only be a few hunnert in the hole.