TR250 pistons

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What are the Vintage Racing limits on the TR250
piston sizes?

I seem to recall some stock Mazda 4 cylinder piston
being mentioned as being the perfect size for a bored
out 6 cylinder.  As I recall, these were basically
identical to the racing pistons for sale and very cheap.
Seems 40 over, with flat tops...  anyone recall this?

How far can you go with the boring?  60, more?

I've seen liners available in TRF's catalog, these were
never used on stock engine?

Thanks,
Roger