hi everyone, i hope i’m posting this in the right spot i have a 1957 f600 with the original 272 stock motor (rebuilt) and i put an hei distributor on it a buddy had one new and he gave it to me. so i put it on set it to 10 deg my truck shop manual said attached the vacuum advance (to manifold has original holley 2300 on it and no ports on the base) and at idle it jumps to 30 deg advanced is this right? or even safe for that matter? common sense tells me no but i’m not sure how the vacuum advance should work it’s my first y block and the original distributor that was in it was original to the motor and it was mechanical only i don’t want to run it until i find out if this is right or not. it idles great so but it just didn’t seem right. oh also there is a port on the upper left (looking at the front of the carb) that has a 1/8” npt brass plug screwed into it is this a vacuum port by any chance? any help would be appreciated. thanks