Distributor recurve
Here's what I measured with the 1979 springs and governor plate in the 1974 distributor (vacuum line to distributor was disconnected and plugged). Initial timing was 10.5 degrees BTC. I only get 7.7 degrees of mechanical advance, which is all in by 1750 RPM. This doesn't seem right.
And here's the vacuum advance chart for the 11.0R vacuum pod. There's no advance until vacuum is about 8 inches, and it maxes out at about 19 degrees advance (above initial) by 14 inches.
Here's what I measured with the 1979 springs and governor plate in the 1974 distributor (vacuum line to distributor was disconnected and plugged). Initial timing was 10.5 degrees BTC. I only get 7.7 degrees of mechanical advance, which is all in by 1750 RPM. This doesn't seem right.
And here's the vacuum advance chart for the 11.0R vacuum pod. There's no advance until vacuum is about 8 inches, and it maxes out at about 19 degrees advance (above initial) by 14 inches.