I actually only have 3 vacuum ports on this newer version of the carb. According to your diagram they equal Ports 5, 7a/7b and 3a/3b. 5 has the PCV connected, 3a/b has the vac advance connected and finally 7a/b is capped. I felt that the vacuum was definitely too low but without it running steady its hard to figure out exactly what the vac pressure is. The key to me is just getting the car to idle correctly. I tore the top end down again, new gaskets and seals and re torqued everything again. I have checked all hoses (not a lot to check really) carb gasket, etc. I am nearly at witts end with this.