Ford did have a brief period of zero balance 302s. They went from 28 to 0 and then to 50. I'm no expert on the 250 six but if a standard small block V8 flywheel fits, you can buy a new zero balance unit.
The Ford Racing catalog lists a billet 157 tooth flywheel with zero ballance. The part number is M-6375-D302.
Summit Racing has it online.
http://www.summitracing.com/parts/FMS-M-6375-D302B/
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