[Aussie Mike]

I had a look at some 300ZX calipers a while back with the same idea. There are a few things to consider with these calipers. The 300ZX runs 32mm thick discs where the Jag has 26mm so the calipers might need shims behind the pads or split the calipers and machine one half to slim them down. Pistons for these calipers are very expensive so make sure the set you get are in tip top condition.

Appart from that, if you can get them for a bargain basement price then go for it. Check the prices for new Wilwood or AP Calipers before you jump in though as some of them aren't that expensive.

Cheers