And stock suspension (88' GTU, if it matters). Will they fit?

 

they will fit in the back with stock. and u will need around half an inch spacer in front.

ive got 17x8 +47 and 225's 45 tires.

currently im using 1" front and rear spacers and it looks pretty good. and has plenty of clearance from suspension

 

About the lowest offset you can get away with is 35mm in front, so at least 1/2" of spacer.