#'s Matching 340 build
Rob is this a stock exhaust build?
we did a lot pf dyno time on 360 motorhome builds in the 70s and also raced in a class with stock apperance
general approch big block or small block is go big BIG and get your power done big and early cus you are not going to get top end hp no matter what you do.
(compared with headers)
At tdc on the overlap you can have 15% of cu inch as residual gas wth little extraction
so you have to use what inerita you do have to clean up the chamber.
depending on your porting you will end with little overlap and a somewhat longer ex