look up www.toyota3tc.com The Americans love these motors and get lots of horsepowerhttp://www.toyota3tc.com. The turbo and manifold from the 3TGTEU bolts on to it. Like anything that requires modding, it's worth while spending on pistons, con rods and rod bolts. You can get away with using stock internals but you will need ARP rod bolts if you want to boost it! The rod bolts will stretch but these motors are bloody tough and can handle 10 psi in stock form with just the rod bolts replaced. You can run them 'all motor' setup too and get big power, check the site above for info. I'm fucken sick of all the twinkie hype ( I know, they are great little motors, don't get me wrong) so I'm doing a turbo conversion on my 3TEU (EFI version of the 3TC).
You could just replace the carbie with twin Webers put a mild cam in it, run extractors and bore it out to just under 2 litres (quite safe to do with a 3TC). You will surprise plenty of punters with this.