That is one gorgeous flathead, blueskies!
I think you did real well getting the tube type headers over the new cast ones. Really nice pieces of work, the ones you have on your flatty.
I like the Motorcraft/Holley/Weber carbs as well, bought some for fitting to the Super Wasp myself.
I would like to get your recipe on what you finally used inside your engine. I really like the intake setup and the Edgy head. I had the chance to talk to Edgerton about the time this thread originally ended and was excited by some of the additional metal casted into and around the chamber profile.
I hope Don isn't counting on those extra 21 cubic inches to sway the track-meeting. The short mopars are capable of some "shock and awe".
Hudson