I just put one(with the new ignitor III) in my 383 and it's at 28 intial just to idle. Runs great over 1500 RPM with great crisp throttle. BUT, it doesn't idle well and I can't get it to start unless I cross the solenoid on the firewall. It seems to drop voltage too much turning the key and I have the positive wire and coil on the hotter side of the resistor.
I also had to move the wires one to the(l-r can't member) to get the vac pot in a decent location.