[kent olsen]

As shoooo32 says you can work with what you have. My 3.0L is an 81. Oh some say smaller valves than the 78, so maybe a little less horsepower, how much is how much.

I had my heads modified for twin plugs BUT I only have 9.5:1 pistons so I really didn't have to do that. Twin plugs are probably only good for 10 or less HP but are much better for high compression.

Since I do autoxing and track days I wanted an engine that had more low-end torque as that's what pulls you out of the corners not something you have to get over 7000 rpm to get into the power. I had a cam cut, a GT2-102, that has the torque down around 4000 and peak power at 6800. She pulls like a truck. Other than that it's just 40 mm Webers (which I later opened up to 42) and SSI exhausts and a light weight clutch.

Sounds like most of that could be done on your current engine in your garage.