So , I had bought a 351W engine in the past and meanwhile I made a teststand to runtest the engine. The engine has a ACCELL distributor and the cap sits high so I have to rise the carb with a 1/2 spacer. So far so good. What do I have : edelbrock 2181 intake which is a 4-bbl Square-Bore Carb Flange. edelbrock 1405 600cfm carb My questions : Can I use this kind of spacer ? I have a phenolic one ? how does the upper and lower seals look like ? Thx !