350 Distributor 4 wire plug

[RMrider17]

Hey I just finished doing an engine swap in my 85 2wd c10 from 305 to 350.

When doing the swap the old distributor decided to stop working, so I found another one but it is slightly different.

The original has a 4 wire plug that comes off of the back of it towards the passenger side and plugs into the stock wiring harness.

The one I found does not have this plug, so itll run but not that well.

Does that plug make my vacuum advance and mechanical weight advances work? because it also only has like 5 pounds of vacuum and im thinking its because it is out of time

Thanks
-Adam