Just another thought on the Dougs or anybody's headers for that fact. I have installed Edelbrock aluminum heads on my 340. Want to get real messed up in the head. Nobody ever told me that the Edelbrock heads actually protrude out in front of the block by about an extra inch?? Now where do the Dougs bent to fit perfect headers sit in relationship to everything else??? I finally figured out why my Dougs headers were such a pain to install, but now I am getting what custom builds really encompass. Add an aftermarker A/C compressor and then try and line up pulleys ect ect ect. It is a chore working through all this stuff. But if you have Edelbrock heads, make sure you are aware of the dougs fitment regarding them????