here's my experiences with each:

I run Weber Alpha throttle bodies on my car, on an ST170 engine. Engine is standard and it has a meaty 4 branch and full stainless and it made 193 bhp last time on rollers. Its 100% reliable, brilliant on fuel and lovely to drive.

We converted a mates XR2 to a 2.0 silvertop Zetec with the Chester Sports Car kit - the kit is very good and the car made 167 bhp, again with a standard engine and big Ashley 4 branch. Its a track car so cant comment on the road but its nippy enough and takes a lot of abuse!

Sorry dont have any Pinto experience but have you considered a Zetec mate? From your sig etc you obviously know your stuff!