I have a spare 401 gearbox that I would be willing to part with if you can't find anything elsewhere. I can highly recommend STS imports who ship car parts between Colchester in the UK and Florida. I recently imported a Chrysler 'box from the US which cost me $250 to transport across the Atlantic - a fair bit less than shipping from Virginia to Florida.
I'm pretty sure they would send it on from Florida to NY if suitably crated.
MGB gearboxes use the same input shaft and pretty much the same clutch as the Bristol and transfer similar power. Also available with or without overdrive. The earlier layshafts gearboxes are a bit fragile if used hard. I think the later 4 synchro gearboxes from the 18V engines are more robust.
I may have a spare bellhousing for a Bristol but it would require a fairly decent machine shop to cut and shut with the MGB.
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