Picked up the Holley HP main body “upgrade” for my 67 383. My old, tried & true 850DP has 8 screws from the baseplate to the main body & the new HP has only 6 bolts, 3 on each end & none between the barrels.

I’m getting a whistle now at idle & have sprayed the base to body gasket with brake kleen & it will idle up so it’s pullimg air right where the screws are no longer holding it tight.

Has anyone had any issue with these new mainbodys on old baseplates?