Like Robert said, try 20 initial instead of 10. Timing first, then carb adjustments.

""I don't have a vac guage""
- Try and pick up a hand held vacuum gage if you do not want one mounted in the car. The vacuum gage will help you tune the carb. You are looking for the highest "solid" vacuum reading that you can achieve with your carb. The hand held unit can be connected or disconnected at your convenience, but you need one to help tune the carb. The vacuum gage will also help you setup your PV size once you get the idle circuit straightened out.

""Upon reinstall, motor starts OK, can't find any vacuum leaks. 5 minutes in, motor refuses to run unless I maintain a very high idle with lots of manual choke.""
- It sounds like your choke is setup good but when the choke opens up, the idle circuit is too lean to maintain idle.