sorry to dig this up from the dead guys but I still haven't gotten this done yet
to make a long story short, the 'deal' on the 95 gsr ended up falling thru. I found a lot of 'hidden' stuff that was wrong with it at the last minute so I bailed.
The good news is in the meantime I found a 96 gsr which was in far nicer shape with no catches. It's got some mileage on it but I'm planning on swapping the B16 setup into the gsr & keeping that as a dd, rebuilding the gsr motor over the winter and swapping that into the Si in the spring.
so I got the part about switching the block mounts, what else will I need to make this whole thing work? I know I'll need to get a '00-spec P72 for the Si to pass NYSI, but other than that and probably stretching a few wires/etc, I should just be able to swap both drivelines leaving the wiring and everything else with their respective cars, right? ie- teg harness stays with teg, etc?