408 stroker header size

for acceleration the 9" deep Canton pan is better than a pan that adds where the kevko does
I had one of those old Milodon pans that the center link went thru, what a pain when I wanted to pull the motor. My last three motors, 340, 363, and my present 408 I am using the Moroso pan.I am pretty sure i will be getting the TTI 340AW2 headers since they fit my Indy 360-1 heads. i am not worried to much about maximum power as the car is run on a throttle stop to run 11.50 anyhow for Street Eliminator and 11.50 index racing. Who do you guys recommend for a TTI dealer to buy them from? I have read Marsh Performance is good. I don't like buying from Mancini as their shipping costs are ridiculously high Thanks