The 915 heads are great heads with 2.14/1.81 valves. Dump that Team G intake and use an Edelbrock Victor 440. We run a similar set up but run a Crane roller cam with .700/.718 lift, 12.8 compression. 3,000 pound Dart runs 10.03/131 mph using old iron rockers and a 1050 carb. We ported the heads to the point of nearly running out of metal on the valley tray at the ports, just use paper gaskets along with the valley tray. You can cut some of the paper gaskets away too.