I'd say it doesn't really matter as to turbocharge you're changing the rods and pistons (at least you should be) so you can do what you want - they all fit to the Zetec crank no matter what engine year.

Of course there are other things to consider like what car you want to mount it in. (avoid extra costs of having mounts made to suit)

If you wanted to build a monster then the CGI block is the strongest.

Edit: to clarify the rods and pistons that Fudge has specced will fit any Zetec of that bore. Later rods and pistons will fit an early Zetec. Start mixing later rods with early spec pistons and you'll be in trouble.

There is a length difference of about 3mm between the different rods, which is taken care of by pistons utilising different deck heights.

I know all this becauuse I speccup up a set of Arias myself for a 2.1 ZVH.