Critique my mismatched Teen Build.

I think you will be well past 320 HP. Maybe 330-340 as a guess... before even looking at the above posts by 1970 Duster and RRR. (I am just adjusting HP from a 340 with similar heads and CR and a step larger cam and 1.6 rockers.) It should well meet your goal of being a peppy street cruiser.

IMO the heads are fine for a street cruiser.... and will make HP. The cam will control most of what will happen anyway and the breathing of the heads will help all around, even with lower lift. Your CR will be good to widen the torque range. Approach full throttle with caution! Let us know when you get that first speeding ticket or blow the rear, whichever comes first!

And mismatched? Not hardly.....I've built and run a small block Ford with similar breathing, single plane intake and larger header pipes, and a high lift cam with much lower duration and it was a great street motor. Veeeery wide RPM range and well matched to a stock converter; the cam made it so despite the big breathing parts.