I'd like to make a bold statement and claim that if pistons and rods are to be replaced in a CVH, then it's cheaper to build a zetec to start with.

Also, if you're on a budget, then Megasquirt will be a good choice. I'd also like to point out that greens are very expensive injectors. And newer Bosch injectors that flow the same may be cheaper then a set of used greens.