whats a good set of heads

You can run some 340 or 360 heads on it. If you get a set of heads with 1.88" intake valves, you can have any valve guy open them up to the 340 2.02" valves. With a little porting, they will run like a raped ape...

However, swapping the 340/360 heads onto a 318 may bring your compression down about 1 point. (like from 10.5 to 9.3)