i'll tell you what you don't need to do on a non-turbo engine...
you won't need aftermarket rods(stock are forged and very stout), main studs, head studs, etc.
the best investment you can make on one of these engines is good port work and a good exhaust. as for the exhaust, if it's an '85-95 engine it's already set up like a good tri-y header. the '84-down engines had a junk exhaust manifold though, so those are best replaced with a header. however in '85 toyota started using a manifold that'll actually improve performance -- just get your pipe where the 2 join up replaced with a 2" or 2.25" pipe all the way back.
