Best Bang for the Buck Head???

If your X heads already have a good valve job and performance oriented 2.02"/1.6" valves and springs you're gonna get WAY better bang for your buck by getting the bowls ported.

Typically around the $500 mark will get them to outperform Edelbrocks and match the RHS heads.

We're talking low 12 second potential in a 3300lb street/strip vehicle.

I disagree....500.00 in porting will most likely only get the bowls done which will not match a good Indy iron head with a 2.02 valve. Your not going to get 260 cfm out of a stock head with bowl work only!
It'll take short turn work, guide boss work, correct valve job, nail head intake valve, and some minor roof work.
Brian