My Friend wants to change the Carb from Teapot to Holley like I did on mine. I changed my Intake to the later "B". He doesn't want to change the Intake. Speedway has 2 Adapter Plates. 1351935 and 1351935B. Is there still room for a 1 inch  Phenolic Spacer? Which One do I need and what is the Difference, I know I need a later Distributor. Got One.Thanks.