thank you all for the info.when you says logs u mean stock 340 manifolds im guessing.Its a mildly built 318 nothing crazy i really just like the exhaust sound with headers.all of my mopars seem to get 4 barrels,headers and cam lol.any of you know anything about the summit sum-g9140 it shows fitting 67 gt v8 ps and 73 dart v8 ps and there alot cheaper.tti are out of the question for me 1000bucks for headers i can buy a complete A body car for that ouch.dougs are 700 a little better deal.