the 300 to 325HP is what I am shooting for also as its at the limit of what return-less fuel system can do. you can do the 300ish HP with a boost a pump and a turbo size that would still make it fun for a DD... However you are also going to need to upgrade the transmission (clutch and will want a limited slip differential). Realize though that a Foci with 300-350Hp is almost 3 times the amount of power out of the same block.
I am right there with you on the money side... have a few hundred every month or so to spend so getting pistons here, rods there, bearings down the road, ect... is still more $$ possible for me than a lump sum.
Many people use the probe pistons or the JE pistons. dont think you will go wrong with either.
2001 ZX3 Zetec - Rebuild "The TICK" (
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2004 ZX5 SVT - Restoration "Code Name Rocket" (http://www.focusfanatics.com/forum/showthread.php?t=722698&referrerid=62897)