Sham - this is the later style of four barrel manifold. It has the Holley base pattern cast on to it - but I'm thinking you must have the earlier 9425-A version with an adapter plate. The early arrangement and adapter will work just fine for a daily driver. Make sure there are no "steps" showing beneath the throttle bores. Also think about getting an insulating gasket or isolator to keep too much heat from cooking your carb.
This later 9425-B manifold looks pretty good - but it only has 4 x 1.438 diameter (1-7/16) throttle bores. To get it to match a bigger throttle bore carb - you still have to have an adapter. Don't spend a lot of bucks changing right away - unless you stumble over one in the barn.
These are "air gap" manifolds (from fifty years ago) and you can get them to run faily cool by using the heavy truck style intake manifold gaskets (292 cid) that have a restricted manifold heat riser port. This will work with your "A" manifold too.
Mr. Mustang: Did you follow those guys web site while they went to California? They took off with 30 year old tires and shreaded them somewhere in PA - but not too much other drama. I think they finally ran the dizzy with standard timing setting and full manifold vacuum.