im pulling my 318 out my duster and building my 340 im just haven trouble on what heads to use this is gonna be a street/stirp car with about 500hp any ideas

 

RHS x-head is a great way to go. flows better than edelbrocks and a little cheaper.

 

Do u currently have any heads? If so what are the casting numbers? If you have a decent set of 340/360 heads u can come out cheaper porting, milling and installing 2.02 intake valves with the stock 1.66 exhaust valves and get just as much flow as x or j heads. The 596 heads were a good canidate for this job. I've got some at the machine shop mow I'll let you know how it works out. But jus like the last guy said if you got the money go with the edelbrocks.