Man, that is impressive. I have a 512 with less compression, less cylinder head, less cam, TF intake, 950 Thumper, 1 7/8 headers that is probably 115 horsepower down from yours.(491 at the tire. 625 crank? maybe?) I've been kicking around the idea of upgrading the top end; heads, cam, intake, Dominator, headers, and this dyno session makes it a lot harder to NOT do it. Although I'm still weighing how it would act in a heavy car with a clutch and a 3.54 gear.