While I had the L78, a friend, who worked for a local speed shop, and I spent a few days doing a little massaging on the engine, port matching the heads, manifold and headers, 3 angle valve job, new crane valve springs, retainers and aluminum rocker arms, recurved the advance in the distributor, put Blue Streak points and condenser, solid core plug wires, Accel coil and distributor cap and rotor, Hooker headers and 2.5" exhaust with mufflers off a turbocharged IH Scout. A little later I built and added the traction bars, new shocks front and rear and put L60-14 MT rear tires and 4.56 gears in the rear end.
One Saturday we took it to the local drag strip at Osceola for a test and tune session. We opened the headers, lightened it up, took out the spare and jack and rear seats, which got it under 3400# if I remember correctly. I made 3 passes the best of which was 12.52 at 106 mph, turning ~5800rpm through the lights. Not bad for a daily driver.
Interesting thing about the L78 engine, was that in Novas, Camaros and Chevelles it was rated at 375hp, but in a Corvette was rated at 425hp. Same identical engine.