It 's all down to what you want to do with car IMO, crossflow are a great engine when tuned , look at mk2 Mikes that we built and installed for him , we done it as a road car with just over 150 bhp and its great , I know cos I built the engine and I,ve driven the car ,
If I was going to use the car all the time and clock up thousands of miles per year then I would consider a Zetec on carbs , the new Weber 152,s work great on the Zetec , we done an engine refresh on a mk2 escort with a ST170 on 45,s and it made exactly 170 bhp on the rolling road and drove fantastic , the let down on Zetec's is the torque figures are crap , a pinto producing the same BHP would slaughter a Zetec because the torque is far superior , we built a 171 bhp pinto for Martin Saunders tiger kit car and the same cars running Zetec,s cant live with him
hope this helps with your options but obviously its down to your budget as well .....