I run AFR 190 heads on my 383 which made 450 hp on the dyno. I run a smallish CompCams 280 Magnum flat tappet cam which is very street friendly. That is plenty of power for a highboy like mine. A set of 195's would probably give you more low end power than the 210's. If the 210's need a rebuild, I think I would opt for a new set of 195's. My 2 cents worth . . .