The 325cc runners are overkill. Go with a Brodix or AFR 290cc at most the AFR 305cc CNC Chamber. You will most likely never allow the bigger runners to run up to there potential unless your runnning nitrous and a big cam as well. The bigger runners will produce nice low end torque, but rev out about 5900RPM.
Im doing a similar build as we speak using the AFR 305cc CNC chambers and should be on the dyno in 2 weeks or so. Just waiting for the heads at this point. Looking for about 625+HP out of her.