If you don't want the housing to move, just don't connect the vacuum line, or plug the line with a lead BB. Then all you'll have is the mechanical advance, which won't be enough for good gas mileage. The people who designed the original advance system weren't backwoods rubes who just fell off a turnip truck.
There are two types of Pertronix systems- - - -the ones that have failed, and the ones that are going to. I'm 75, and a little crippled up from a motorcycle wreck, but I think I could outrun anybody who tries to GIVE me a Pertronix ignition! I'm in the process of modifying a stovebolt distributor to use an OEM general Motors reluctor and pickup coil, which will trigger a remotely-mounted GM module on a heat sink. Untold millions of those systems have worked well for nearly 50 years, with a very low failure rate. They're also "idiot proof"- - - - -no current flows anywhere, even if the ignition switch is left on accidentally, until the module senses a signal from the reluctor indicating the distributor is turning.
Jerry
