Van tells me he took a bone stock unmodified 1968 C8VE 460, disassembled, ball-honed the cylinders, ground the OEM valves, replaced only the bearings, new OEM-style link timing chain, super mild (~0.480") mile RV cam, (nothing else) and reassembled. He did 10.30's in the quarter mile all season long....not so much as a spark plug change. Unported heads, one carb, pump gas.
Paul