dont think you will get a RB26 in a gem, I have seen geminis with FJ20's, SR20's, CA18's, 13B but no RB's at all. If you need info on fitting an engine into a gemini check out the ozgemini forums but make sure you search before asking because they can be pricks over there. I use to own a gemini (still own a TX Coupe project car) so I have spent some time there. I would much rather see you put a RB26 in a 260z, Sexy car with a sexy engine