Heads Help!
x2. You can stick a mild cam in it, some 901-16 Comp springs, a set of standard retainers for the exhaust valves, and an intake/carb & have some fun like that. You're not going to repalce the heads to any real benefit for $1000. You'd have to do too much other stuff, costing more $$. How are the car's wheels & tires, brakes, and suspension? You will get more results in terms of autoX performance by upgrading those things first.