Like Karlos said mate, if you don't have efi there really is no point. Do this first.

tbh, you will probably pull 250brake with utter ease on a decent zvh, most people seem to get a solid 280 brake with out spending a fortune.

Aston_b, IMO i think you can build a 300brake zetec for the price of a standard rebuild, a t34 and some pistons.

Rob,