To run 10.00 on a 100 degree day would require over 650 hp off the dyno, or there abouts. The biggest flat tappet that will work in your motor and converter combo is the direction I would head. Unported heads that are basically cleaned up will need plenty of cam to compensate. My 499 with cleaned up -1 heads at 3,000 lbs would go 9.50s with a .717 lift roller of 283/290/110 duration. You have a little less head, and want to run a flat tappet, in air that will cost you two tenths over what I ran in.