[donraye]

Thanks to all for your valuable input. I also ran this question on the FordMuscle.com tech forum and got some good advice there as well. Taking in the consensus view of those that had experience in this are I have made my choice which was somewhat limited as i had to get the piston that worked with the crank, cam, rods I alreadt had. etc.
I decided on Mahle froged flat tops with 6.6cc valve reliefs and all edges are factory radiused for detonation control.
This choice would give me 11.1:1 with the usual .040 gasket thickness, but I have decded to run with a copper gasket and to increase the compressed thickness to .064. This will bring the compression down and put me in the 10.6:1 range at which I feel much more comfortable.
Thanks to all for this discussion and your valued input.
I'll let you all know how it came out after the build and dyno tuning, etc.
Don