[ERA Chas]

Hsss,
Unfortunately, you can't cc heads on the motor. You can be sure yours are very close to mine as I also cc'd my iron med. risers which had 2.25's and 1.75's [same as our Shelbys], weren't cut, and those were nearly identical to the Shels.
DON'T CUT THOSE HEADS, IMHO! If you want to gain compression work with pistons, gaskets and deck height.
Those heads will support A LOT more induction [and compression] than your small carb and small cam -and still be very streetable.
A cam with lift in the low .600's and durations of 240 - 260@ .050 with a 110 deg LDA will work fine.
You need to really decide how you want to use the motor. Right now, you have pretty big heads [in volume and flow] and miniscule induction and cam. Keith K or some of the other pros can get much more out of those heads.
Best to contact some pro's for advice when you know how you want to use it.
I agree, Vizard's a sharp guy.