anyone hear of these heads

I've seen a few threads about these heads in the past few months, but it doesn't look like anyone is running them yet. If your pistons don't have larger valve reliefs than a stock piston (eg. 4.030 stock replacement pistons), then the 2.02 intake valve will probably have clearance issues. The only heads I know of that can run a 2.02 intake valve with stock pistons are Twisted Wedges because of their canted valves. The ones you posted have inline valves.

Muscle Mustangs and Fast Fords reviewed them. They came out pretty good.
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