With typical 6.76" long connecting rods, a piston with a compression height about 1.32" puts the piston near zero deck. Some specific rod lengths, pistons, and block deck heights may result in the piston down the hole (low compression ratio); so check the details (especially the machined deck block height) of the parts you plan to use:

+9.980 Block deck height (could be 9.97x after machining)
-1.875 Crank stroke divided by 2 (3.75/2)
-6.768 Connecting rod length (many H-beams are 6.760")
-1.320 Piston compression height
------
0.017" below the deck

And be sure the pistons you buy use the pin diameter to match the connecting rods you use (1.094", 0.990" common)

Examples of pistons:
Bore___CH__weight_ring pack sizes__piston pin size_ part no.
4.375, 1.320, 510g, 1/16, 1/16, 3/16, 1.094 x 2.930, 99494 Ross
4.375, 1.320, 527g, 1/16, 1/16, 3/16, 0.990 x 2.930, 99495 Ross
4.375, 1.313, 524g, 1/16, 1/16, 3/16, 1.094 x 2.930,131175 JE
4.375, 1.313, 525g, 1/16, 1/16, 3/16, 0.990 x 2.930,131174 JE
4.375, 1.300, 515g, 1/16, 1/16, 3/16, 0.990 x 2.930,K296A35 Wiseco

Check KB also. I don't know if all the above are still available, but they were stocking parts back then.