SBC Block question

It was 9.300 deck Olds rocket block, 4.125 bore, 4" stroke, 6.100 R&R rod, Valesko crank, .070 head gasket, arp 7/16 studs torque to 75lbs. 11.2-1 copression. Brodix -12 heads, Littlefield 14-71 HH, Hogen intake. 2",2 1/8, 2 1/4 header...
The center cylinders would leak @30% (3 into 5 and 4 into 6) at first I would replace headgaskets often... Untill I called ODDys, they told me that is ok and just race it... we spun it to 8400-8600.

We ran 7.20 193mph at 3150lbs trough flowmaster colletor mufflers.

Good luck
Andy