The 1300 piston idea is great for a tuner kid on the streets as "cheap" compression gain. But for the ITC racer, if you want to deck the block/head, there is already very little room to deck and still be within the compression ratio. Plus, add in the aftermarket 0.040 over pistons and the ITC motor will kick the 1300 pistons butt.

The real gain in the ITC motor is in the head. Good, smooth, careful port matching, the right header, good new tall cam lobes and good lift from new stock rockers. We measured my old rockers and couldn't believe the difference in wear between them. If you're going to spend money and time on your motor, start with the head.
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Fully agree on all points.
In addditon the 1300 pistons are illegal.