...The distributor shaft has developed some play and the vacuum advance does not advance... so I am not opposed to going to electronic ignition (pertronix). Will the upgrade make the wobbly shaft (which causes the point gap to open unnecessarily and unpredictably) a non-issue? And I am pretty certain the vacuum advance will still need to be fixed somehow, or is there a magic way the EI will solve that as well?
No magic. Your distributor’s internals are wearing out. I would say there is a high probability that a pertronix upgrade will not
make the effects of the wobbly shaft a non-issue. Essentially, you would be adding something new to something very old & the something very old controls the effectiveness of the something new.
The shaft’s wobbly axial rotation will have some non-optimal effect on the optical trigger mechanism’s precise firing signal. The degree of effect depends on which distributor assembly components (bushings, gears, housing, etc) are worn.
Regarding the advance: There is a good chance one or more of the advance’s mechanical components (springs, weights, bracket connections), the diaphragm, or supply hose has failed.
You most likely will first need to determine:
- what parts are worn?
- can the parts be replaced?
- Can the Bosch distributor be replaced by one which is in better condition?
- Can a distributor in better condition be sourced?
Or consider doing what I did several years ago…
This is the result of my decision...