Heads Help!

So I'm doing a lot of Autocrossing and want to maximize my HP/TQ per $$ on a LA 360 I have. I believe it's a 1975 360 that has been rebuilt, haven't had the heads off but engine looks very clean inside and runs well, feels like about 200HP and 300 ft/lb at the rear wheels... My question for you all is how to get the most out of my heads without a lot of $$, OR, should I be looking at another head option? Chinese aluminum heads are about $1000 assembled, that is the most I would like to spend, but can I get just as much flow and a nice 10-1 compression out of magnum heads or j heads or my smog heads for less $$? Opinions welcome, thanks in advance...