If it's running with the current motor I'd suggest getting to know the car and it's build quality before you start spending serious money on it. A 2 litre Beta ought to produce 120bhp in standard (European) trim but might be as low as 85 if it's a low compression US/emissions motor. You'll end up spending a fortune building this motor up to a reasonable power level (higher compression pistons/inlet manifold with twin 40's and cams) but 180bhp is achievable. Guy Crofts book on the Twin Cam is recommended if you want to go this route.
Conversion to the V6 Alfa in 12 or 24 valve form should see these levels of power (and better torque) for similar money but with an unstressed motor. The downside is that there are some modifications needed to the chassis to fit the Alfa (or Ferrari) motor. New mounts, driveshaft spacers and relocated steady brackets plus upper gear linkage mount, the gear linkage also needs revision plus a new exhaust.
Long term the V6 is the route to go and it's something that I'm really glad I did to my Transformer/Hawk.
Guy
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