That sounds like the plate I have... made by Cecil Yother.
It has a 3.5 bore size.

I also have a 'home made' plate with a 3.445 bore.
That plate is actually the sawed-off top deck of an old engine block, with drilled-out head bolt holes.
DD

Looks just like the one I have

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

The Slant guys definitely do a lot more involved racing than other inliners are doing. So that's why I am asking. Mine will be much cheaper than a store bought one and can accommodate what ever bore size you need as well as 1/2" head bolt conversions, which for that you will definitely need a torque plate to compensate for the extra stressing of the deck and cylinders when its bored.

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There's no such thing as too much cam....only not enough engine!