Quote Originally Posted by rumrumm
My guess is that you have a vacuum leak. Check all of your vacuum fittings to see if the are tight, and check the hoses to make sure none are cracked. Vacuum leaks can cause havoc with the way an engine runs. That is a nice looking engine BTW.
I agree ..sounds like a leak some place. On another note I dont like ram horns. Have you ever considered a header that goes over the frame?
Might not be the look or sound you are looking for but it is an idea