643 HP at the wheels, then......

if I go with a custom piston this time round it can have an extra couple of thou added. this means I can block fill the block now and still be .040" ish oversize. better than .060" that I had considered. will look at JE, CP, Ross inverted dome.

thought bout bolting my old cast crank in when I fill the block and torque it down along with the old iron heads.