Break the bank.
Bust it open.
Order up a set of Ross or Icon custom forged pistons made to the compression height, dish volume and bore size you need.
I wouldn’t order them until the block is decked (to determine compression height) and after your machinist determines the final bore size.
In the end if you buy a heavy press-pin TRW/Sealed Power/Federal Mogul piston and then cut a dish in it you’re pretty much within a hundred or two dollars of a better full-floating pin forged piston that uses a more modern ring pack anyway.
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1964 Tempest Coupe LS3/4L70E/3.42
1964 Le Mans Convertible 421 HO/TH350/2.56
2002 WS6 Convertible LS1/4L60E/3.23
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