Looks like a nice intake, when are you going to put it on the engine? You were running a 4150 intake with a tall adapter before correct? If you have the room a one inch merge type of spacer will work great on that intake. If you don't have the room then it will still work fine with the Dominator bolted right to the flange.
I went from a victor 440 and 1-1/2” tapered wilson adapter with a 1050 dominator to this same M1 4500 with no adapter (i put on the stock flat hood) on my 10.5:1 505” in my 68 charger. Both intakes were cleaned up at the radius in the plenum and port matched. I lost a tenth and almost 1 mph.
