no not on ur motor....the 90-94 DOHC head from a 4g63.....and the DOHC head from a 94 galant is completely backwards of ur motor....ur timing belt is on the passenger side....the 90-99 is on the driver's side
just to answer the turbo question. i know a couple of guys that are running above 15psi on the stock pistons with no problems. and as i said before, one of them is running 19psi daily