Earl is right. There's a $1000 of stuff for a stock TR that probably won't make you go any faster, but will enable you to go at least as fast as a stock car should without blowing the thing up.
Fuel pump, hotwire, modern chip, scanmaster, timing chain, valve springs, and a new maf and translator. Those are the first things I'd do, and might as well get injectors with the chip and save yourself some bucks later.
THEN you can start talking alky or race gas and good tires and then you'll need a $3000 transmission and torque converter and then the suspension mods start mounting and by now you'll need reinforce grounds, several backup ignition modules and coil packs unless you go TR6 ignition, etc...read, read, read. Tune, tune, tune.