Is this part that hard to understand? Have your GSR pistons mounted onto LS rods, use the LS crank. BAM youre fucking done.
Or, to raise compression, get a set of PR3 or P30 pistons, pretty sure you'd be sitting at 11.x:1 CR, which is good for all motor setups.
What are your future plans with the car? You gonna boost it?
Make sure you replace the stock rod bolts with ARP rod bolts otherwise your LSvtec will be a waste of cash, cuz spinning it past the stock LS redline would not be a wise decision.
Also, if youre LS SHORTBLOCK is 90-95, I highly suggest purchasing NEW from HONDA/ACURA a P72 oil pump, which is found on all 96 and newer B Series engines. This oil pump is often referred to as the "ITR oil pump" which in reality... is the same between ITR, GSR, B16... blah blah from 96+.
Also, since now youre entering the world of LSvtec, I also suggest purchasing the Golden Eagle LSvtec conversion kit... but, I also suggest ditching the headgasket thats supplied and using either an OEM LS headgasket or possibly getting a cometic headgasket to fit your bore...
You following me?