johnny, let's back up for just a minute here. I'm seeing a mismatch of parts in your selections.

Assuming a 0.030"-over 350 (355), flat-top pistons with 4 cc's of valve reliefs, zero deck, 0.039 gasket, those 64 cc heads are gonna result in a compression ratio of 10.5:1, way too tight for the cam you picked. You'll almost certainly never get the motor to run on pump gas without pinging.

Use the free information that's out there from dyno tests to put your combination together and you'll be far happier with your combo. Take advantage of the money other guys have spent. Look for healthy torque numbers and disregard horsepower for a street motor.

Among many others are the tests done by Air Flow Research. I was just looking at their site and saw a test on a 355 Chevy using their heads with 180 cc runners and 74 cc chambers, with a low-buck Comp Magnum 270 hydraulic cam. It makes over 400 ft./lbs. of torque from about 2,700 r's to over 5,500 r's with 469 ft./lbs at 4,000 r's running on 93 octane pump gas and a c.r. of 9.5:1. Just as a matter of reference, this motor made 430 hp.

With flat-tops w/4 cc reliefs, zero deck, 0.039" gasket and these 74 cc heads, you'd be at 9.45:1, so that's probably the combination they used to do the test, rounding off the 9.45 to 9.5.

Go here, click dyno tests at the top of the page, then click small block chevy. http://www.airflowresearch.com/

Also, go here and pick out all the 350 combinations.
http://www.ryanscarpage.50megs.com/combos1.html