a tdo4 is a pathetic turbo, they are shit. im not going to go into the reasons why.
so are the nissan t3's all they are good for is the exhaust housing.
water lines, the cold start lines are easy to get to and usually the right size.
a 600 x 300 x 75-100 is far too big they are rated for over 500hp, just use a vr4 or evo cooler,
basically the only difference between a ze and 20v bottom end is the pistons,
if you put a 20v head on a ze it wont have the 5th valve cutout. same as if you put ze pistons in a 20v.