Engine sputtering at about 65

Thanks for the info on the cam, by the way, I didn't know that you could pick up on the cam by the vacuum. I don't have a gauge in the car, I just hooked up an external one when I was checking timing. I will probably end up doing a rebuild on this at some point, so knowing that there's not much of a cam in there already is good info to have.

This happens with a moderate acceleration, if I slowly try and increase it, there's pretty much no response, I have to ask for it moderately to get a response and the response is the sputtering.

The sending unit and the fuel gauge has never worked, but neither has any other gauges on the dash so I was hoping that was an electrical issue. Perhaps dropping the tank is going to have to happen. I'm not looking forward to this if I end up having to replumb all the fuel lines.

There's such a laundry list of things to do with this car, but as far as the motor goes, I had decent performance with it right from the beginning, so this is bugging me and a little bit strange.
This happens with a moderate acceleration, if I slowly try and increase it, there's pretty much no response, I have to ask for it moderately to get a response and the response is the sputtering.
late-to-the-party powervalve




Before you start all that, just do a fuel-pump volume test ; 1 qt in 1 minute at 500 rpm