Here's my latest thought to maybe bring the timeline in a little and eliminate headaches. I naturally assumed that headers was the way to go for exhaust system for the 340. The engine has a Edelbrock Performer and 850 CFM Carb, relatively mild cam. I will never race the car hard. Should I eliminate the header fitment headache, and just go with stock exhaust manifolds? How much dropoff should I anticipate, and will the rebuild be significantly simplified?