Heads have extensive porting done and hopefully should be in the 260 range.....as far as Erson.....I don't understand your comment, I have a custom Erson grind in my 565" BBC that pushes my 63 vette roadster @ 2550# into the 7's @ 170+.......where does your Erson comment stem from, would be interesting to hear...??????
I hope your close on the 450 # I believe it should be very close, just looking to see what others thought, this is my first small block Mopar in a very long time, ran a 340 in my 72 Challenger that ran low 11's, but it was a roller and stock stroke, but way more compression and cam 8)
