I think you are on the right track, with small mods. the gears will do more for you than anything. I would have 1.94 int and 1.60 ex valves put in the heads. the porting is going to be expensive on iron heads. i would also mill them .045to. 060 for more compression. A set of headers will help, but are they worth the work, and expense? duals ,of course. i like the aod idea. if you have the 4100 series autolite, you might want to go to the larger carb it will have 112 on the left side of the ft float bowl, yours should read 108, if it is a autolite.the petronix is good. herbert has a good street cam that is .475/.500 lift, with adv, duration of 275/285. I have used over 50 of these cams and everyone was satisfied.