Carburated 83-84 Intake Manifold question

[78StangII2+2]

I have a 5.0 with an aluminum intake out of an 83 Mustang. I am running a Holley 1850 carb and a 1" spacer plate. The manifold has the chamber for the EGR gases coming up on the passenger side. The regular carb gaskets don't cover that chamber and I am having a slight exhaust leak in that area as the carb just sits on the edge. I tried to find an EGR plate without success. Does anyone have any ideas on a fix for this problem?
Thanks/paul

 

[faststang90]

i had a intake like that. when i got it they had installed a freeze plug in that holeand it had red rtv on the freeze plug