How Much Vacuum??

What's the big deal?
It will run your power brakes.
I have a 230/237/110 in a 360 that pulls 10/12 at 750. It's a stick car and will pull itself along on flat level pavement,down to 600 rpm easily enough with a 10.97 starter gear, if I pull a little timing out of it with my dash-mounted,dial-back timing gizmo. Initial idle timing is 14*, and I pull 7* out to do that,else it get's a little jumpy.At 600 you can finally hear the rumpidy-rumpidy......
But that cam, on the street, will want a lil more compression. With an ICA of 66*, your Dcr falls to 7.55/148psi cranking cylinder pressure. It'll be a wee-bit sluggish off-the-line, with 3.23s and a stock stall. And the power doesn't really get going until she's wound up pretty good.Amazingly enough 66* is the same ICA as the stock 340 cam; 268/276/114. But supposedly the stock 340s were "rated" at 10.5Scr,IIRC
So; what's on your mind?