On my 69 Nova is measured around inch and half(not exact), but I'm surprised you don't have one already existing. My brothers 69 Caprice already had one open when we recently converted it to manual from T-400 and not many of those ever came with sticks from the factory.
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1969 Nova SS 350
406/M20/3.55
13.68 at 105
It should be just under and towards the motor from the mastercylinder should be a plate held on the fire wall with screws and it should have a gasket between to seal it.
Its approx 1 1/2 to 2 inches in dia. A rubber boot should replace the plate for the four speed conversion....MIKE
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