It's a 60 over440 11.5 compression 67 heads fully ported big valves m1 intake cam is .645 lift intake .650 exhaust 280 at .50 intake 285 at.50 exhaust 106.5 Sep install at 103.5. .020 intake lash.016 exhaust
You have 280@050 duration? I'm surprised it even runs with that much duration. My pump gas 470 makes 775 hp and has 264@050 duration so I think your cam is way too big.
