I think you're on the right track, that motor's biggest defficiency is the compression ratio which will be corrected with the 64 cc heads. The car is light enough that it could be made fairly quick even on the 3.08 gears. I just turned a 15.37 quarter mile at 88 mph in my '76 truck and that was with 3.07 gears, stock converter, and a small block that idles so well you'd swear it was stock. It runs 89 octane, too. I was also shifting at 4500 rpm and the cam doesn't even make peak power until 4700 and should rev to about 5500. I used Comp's XE256H cam, which is a step smaller than what you picked. Because you're car is lighter, you should have no problem getting away with the next step bigger cam on the same gears as me. Now, I topped it off with a pair of Vortec heads and an Edelbrock Performer intake. Other than that, my combination is pretty much what you picked out. I'm running a stock Q-jet and a stock HEI (one of the reasons I was shifting at 4500). With an upgrade to the valve springs, ignition, and some 3.73 gears, I feel like I could be in the mid 14's and thats on a 350 powered truck that runs 89 octane and gets 16+ mpg on the 3.07 gears.