Streetmaster to Airgap

Well, after close inspection and measuring of the mighty 318 street master it's evident that if you attempted to open the plenum you would open it to all the great outdoors on the drivers side. I strongly suspect the same efforts applied to the passenger side would open the plenum to the exhaust manifold. And then if you actually tried to open the runners up to a stock 318 gasket size, it would be like doin the same to an 318 SP2P. There wouldn't be any runners left at the plenum area. Good manifold to mill into a base plate with flanges to build a sheet metal plenum and runners for.