Engine / Turbo configurations on a budget

Hello gents... let me first start off by saying I am new to the vw
aircooled world, but no stranger to automotive performance in the least.


I've recently come across a 72 superbeetle, and am interested in
getting a decent amount of power out of it.

My question is this... whats the biggest jugs/pistons I can use on the
stock cases? I was told 1835 by one person and somone else was saying
1640 or something.

In addition to the bigger pistons/jugs/crank and cam, I was going to go
with something like a T04 turbo etc.

I was wondering if anyone could give any advice at all as far as trying
to not have to have the cases machined out (or buy new cases).

And if 1640 or 1835 are the correct sizes, you think I could hit a
reliable 130hp or so, given I had some nice high perf heads and cam?


Thank you guys for all the advice, I really appreciate the help in
advance, been kinda hard getting answers.

Weston