Based on the one photo....
You could simply do a make-over of anything that's suss.
Replace all the Shit like suspension bushes, joints and rod ends.
Replace/overhaul the brakes.
Revamp the cooling system, every hose, clamp, radiator and heater core.
Overhaul or replace the alt and starter.
Service the engine, auto and diff.
If an A/C car, overhaul it.... if not, fit one for the Nth Qld summers.
Touch up any bodywork, clay bar and ceramic polish the living Shit out of it.
5 new tyres and shuffle off to Qld Transport.
You'll have a very nice chrome bumper cruiser that won't smash the budget.
OR.... you can go all out..... but its a friggin big job and costly.