I haven't done it on an svo...but I've done it on a few ae86's. I'd imagine quite a bit is needed.
Head, intake, throttle body, throttle cable, injectors, harness, ecu, head bolts, head resurface, valve job "might as well", seals, head gasket, exhaust manifold, new exhaust "custom most likely, maybe steering shaft or rack if it is in the way of the intake or exhaust, distributer, coil, ignition. There are lots of variables. You will find the problems as you go lol.