I have a 4150-750 on the car. It’s an 80Z with an updated Cam, though I don’t know a lot about the car just yet. Other than the Cam has caused me low vacuum issues. I’ve taken it into a shop a few times for miscellaneous things like timing, brake lines, tranny oil change, etc. I went to pick it up tonight and it started real hard. I had to pump it quite a bit to get it to go. The owner came out and said it’s a bit cold out here (45 degrees) and your 750 doesn’t have a choke. He told me to pump it good when it’s cold and he suggested I may want to consider updating to a Holley 650 with electric choke. He said the carb is too big. Any thoughts on issues with going to a 650? Not sure why the previous owner went for a 750. The carb codes are 4779-7 and 1800.