Hello. I’ve been having issues with the sc since I got it rebuilt the carb replaced the main jet and intake gaskets. Turning the jets didn’t really make difference unless I ran the main jet way out. I thought I had a good seal at the manifold. I tried a propane torch unlit and no effect but dousing the intake port with carb cleaner I could tell it was sucking. I just had the manifold reface and not sure how much he had to take off. Can’t pick up the manifold until tomorrow. So how important are the ferrules on the intake ports. If there’s enough of the ring in the intake port I’ll file them down. If not can I get by not using them as long as everything bus lined up on. Thanks.