Well obviously you're not going to make the power Of a T34.63 for starters, BUT you'll have instant respone but it will die at 6-6.5k revs.

Depends what you're after and what you want to use the car for, imo a live mapped TT Stage 2 T3 car is a great, punchy road car, but as said you'll make 310-320 max, if you want 360-390 then stay with what you have.

Hope this helps

PS, T34/48 is a great inbetweener