Here is a little more info:
* MP electronic dist, chrome box. 20 deg initial, 16 mechanical, advance springs changed to one light and one heavy
* 800 Edelbrock carb, re-jetted and rods richened, larger needle and seat than box stock
* The plugs look spot on with no signs of too lean or rich and no detonation
* The head gaskets are correct, no cooling holes mis-aligned or blocked, that was all checked before final assembly
* Block was sonic checked before an .030 bore, plenty of material so the walls are not too thin
* The radiator has about 2700 miles since new and was cleaned before the new motor was assembled. 700-800 miles on the new motor. It was new from Year One.