Littlechevy.... That's not the car I was thinking of. But that is a very nice elky and I think the cam regardless of what it is, sounds wonderful. Far as I'm concerned that Quadrajet is the best street carb made. 12.5 mpg is a little hard to take but I'm not so sure there is a lot of room for improvement with out a major swap like Jerry Clayton is suggesting. The worst gas milage offender with a hot rod like yours is attached to the bottom of our right legs, as we just can't help ourselves !