Slant six Holley 2280 stalls when stopping

So carb bolts were tight, but I removed it and the spacer and cut some gasket material to put both above and below the used spacer.
Fired it up and still cant get below 1k rpm.
Moving on to the other things.
BTW I am going to order a new flange gasket for the holley do I need to have carb gaskets also? FrainBried.