I think your weakest link in your transaxle would be the axles and CV assemblies themselves. A "soft" stock type diaphram clutch pressure plate will save allot broken parts in your drive line if your thinking of putting big power to a set up not designed to handle much torque, trick I learned hot rodding VW's with inheritly weak stock transaxles which were designed to handle about 60 Hp. I could side step the clutch @ 6000 rpm and speed shift any gear on my souped up 69 VW and it would slip just enough to absorb allot of the intial shock and the stocker would live, if I went to a higher pressure performance pressure plate and or rigid disc, It would self destruct quicker than a cat could lick its azz, just a thought.
Goodluck ><Cp