Slow 6 more power

Guesses...guesses...more guesses...new guesses on top of old guesses baked into a set of assumptions...

No, sorry, "Increase the compression" is not necessarily a right answer here. How do we know this guy doesn't just have a '73 with the timing set at 0°, the OSAC valve still hooked up, and a few other problems that make the car a complete dog? Or a '71 with that California no-vacuum-advance-til-third-gear setup? Or a '72 with the California no-valve/full-time EGR? Or a heavy '76 that started life with 2.76 rear gears and someone swapped in a 2.45 or something from an F/M body? Or…