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There is quite a bit you are missing....
you will have to pull your pan in order to tap the oil return line. Is the T25 water cooled? you'll have to pipe that as well... using a turbo manifold you will probably have to remote mount your oil filter.
the problem with running a bigport on boost isn't necessarily it's compression, as the later gze's had 10psi and 8.9:1... but that the pistons are cast units and are not meant for boost.
That being said, I'm currently sourcing a bigport gze manifold to throw an n/a bigport into my gze car for fun until the smallport gze gets rebuilt..... that car, however, is already on MS.
If you go with MS the biggest problem you will have it 1) getting it started and 2) tuning it.
if you go with a gze ecu... it's tuned for 7psi and 8.0:1 compression... without easily being able to back out timing or increasing fuel... you're asking for the motor to end.
if you want to boost... then throw out the idea of swapping in a 20V, and get in the mindset that swapping motors is easy in these
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