1992 celica help?

A 5S-FE is not the easiest engine to get more power out of beyond simple basics like intake, exhaust, etc. If you're really wanting more power, you'd be much better off looking into a 3S-GE or even 3S-GTE. The automatic is going to be a drag too; your best bet would be to find a nice JDM 3S-GTE/5 speed combo and swap the whole thing in. If you wanted to go whole-hog you could convert it to AWD All Trac/GT4 spec, but you'd be better off selling it and just buying an All Trac by then.