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Transmission gear ratio and engine / wheel size.

During a recent thread on the "for sale" forum, the topic drifted to transmissions. And I realized I have quite a bit to learn. 

I now have a 1835 engine with 15" wheels
The trans (via the IM build sheet)  is VW type 1 irs touring - 4.12.1 final drive.
The car was originally built for a guy in Miami who let it sit unused for over a decade. I imagine he ordered this trans to go to brunch in flat Miami , and that is about it.

I live in north Georgia mountains and the shift ratio is a challenge.  Big gaps in the power band.

So ...My questions:

4.12.1 ? (I have to admit, I do not know what that means.)

If I keep my IM Roadster, I will up the engine to 2110, 2276, or 2332 (suggestions?).
Can the type 1 trans , with a Kennedy stage 1 clutch, handle the torque of a stroker?

What gears would work best for a stroker with the 15" wheels?

Obviously the whole trans deal is new turf for me. The last one I built was off a dirt bike when I was 15. So I know nothing.
Is the VW transaxle  rebuilt  basic enough for a moderately talented home mechanic to handle?  Or are their specialty skills needed for the pro? 

I am in the throws of bringing a '76 BMW 2002 back to life, but later this year I can return to the IM.
At this point just gathering knowledge.


Thanks guys!

 

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