No substitute for cubic inches? Reminds me of a guy I worked with back in the 60's. Took a hi-po 273 that he somehow got to turn 9800 rpm, and stuck it in his 64 Dart 4-speed with 6.17 gears. Nobody could touch this thing. That car was a blast.

I would probably build the 383, for psychological reasons only. It seems half the new cars out there run low 13's right off the showroom floor, with the a/c on. You wouldn't feel as bad losing to a new CTS if you "just" had a 383.