I talked to the crew last night and we are thinking of buying a 390 set of headers and use my flange cut the 390 headers that we know fits this truck, and weld on the 400 flange. I know the FE 390 seems like a big block, but the deck height on the 400 is 10.297 and 390 is 10.17 with a bore...

I am a new-bee to this forum but a long time truck builder.I have installed a 400m from a 78 Lincoln hooked to an AOD out of a 96 F350 and I have bought the stand alone electronic control any comments or caveats would be appreciated.The main obstacle is the headers, as I do not want to...