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From what I've learned from all the wisdom on these pages, is that the stock manifold has a small "v groove" cut into it that aligns and locks in the EGR plate, so if that plate is removed, there is the problem of dealing with that remaining groove in the manifold that several folks noted is...

Hi Andy - the adapter is 0.85" tall - so it does increase the height..... we were a little worried, but i don't have the ram air and it fit fine. I would expect it would push the envelope with that add-on since it  the ram air foam seal has to fit well around the air cleaner. 

Thanks to all so much for the advice and options!! I about went nuts looking, but FINALLY found an adapter for that one-off 73 spreadbore that would allow me to keep the factory manifold and bolt on a squarebore carb. Trans-Dapt 2199 adapter dropped right on the factory manifold and EGR plate...

Looks like this is the resounding intake recommendation - from Mustangs Unlimited??? (Blue Thunder Intake Manifold Dual Plane 351C-4V - BLUE THUNDER IM-351C-4V)?? Thanks Gentlemen for the input !!!

Thanks Mr Ray !   Tim

HI Folks - Have seen lots of notes and have now experienced flooding issues with 73 Q code Autolite 4300D 4bbl carb. Has anyone successfully replaced with a comparable and satisfactory new carb with the spreadbore intake?  Or will a change definitely require a new intake to match up? any...