Question is answered: 273 Engine Block Decking

Zero deck is not going to work with those 4v pistons as they are pop ups IIRC, or very close to it..

OldDart 66, closed heads chambers are not circle shaped when you look at the bottom of the head, they are heart shaped or D shaped. Opens are full circle. The domes on the 2 valve relief pistons are opposite the valve side so they 'fit' into the head on those motors.

attachment.jpg