Hello I missed some time ago my vette a completely overhauled 350 4bolt engine for it was also an overhauled supercharger installed by the company pro-charger as carburetor have recommended me the amis a Demon 650 Mighti now we come to my problem the engine runs in stand until 2000 revolutions super the fitting valve is connected to permanent vacuum and works well is open in stand gas and closes with increasing speed so the system the charging pressure of about 0.6 ba r can build up until then I understand the history of the carburettor still has a vacuum connection which according to the description vacuum instrumentl calls itself now the question is connected here the hei distributor with a vacuum can or does it at all with such a distributor because somehow he must go in early ignition with the permanent vacuum connection at which also the fitting valve is connected it doesn’t go there he starts to become reversing is yes somewhere clear because the vacuum is losing and slowly the charge pressure is building up so people can help me or I need another distributor where is the hook I want to finally enjoy v8 again mfg