I modded out a '79 turbo Regal back in the late 1980's. It was a very fun car. With some intake/exhaust mods and water injection, I could run 15 lbs of boost on the street. Some race gas and more boost and it would run 14.10's at the track. It impressed the guys at Cars Illustrated enough that they featured it in their mag. If I ever get around to rebuilding it, I'd like to do a blow-thru carb setup with intercooler, and some modern electronics for boost control and timing. 1979's had the 4bbl standard, and it's the first year with the improved cylinder heads. Engine control is largely with vacuum operated stuff, so that needs to be checked out. Hot Rod magazine did a series of build-up articles called 'Sunday Driver' between 1980-83 or so.