Just do the heads & exhaust for now& see how you loike it. You won't see a big jump in speed, but should see some gains. When you get greedy later, then you can get the cam or carb.

Nope, in all honesty, you could do the heads & nothing else, but if you do the exhaust it'll breathe better, hence it'll perform better. Every single thing you do will give you a lil bit, combine them all & you get what seems like alot.