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It should be ok... I'd like to see it closer to 1.15 or 1.20 (if not even more than that) for more thickness in the area under the valve "pockets" and a little bit better ring placement, but It should be ok for that size shot.
Well I passed on that motor and decide to build a 418 and went with Wiseco piston # k464x7. It has a 1.110 compression height. It comes with the kit you buy from TSP.