Electronic ignition Slant six with low comp

A hotter spark helps a leaner mixture ignite. Very important for better mileage and lower emissions, and why no cars have been designed w/ points ignition since ~1990. If your carb runs even slightly rich (typical), e-ignition won't help much. If you do go electronic, skip the earlier systems that require a ballast (Mopar 70's, original Ignitor, Crane XR700, ...).

My 64 slant had ~1/16" gunk under the valve cover. I washed it away with gasoline, w/ oil pan off and a big pan to catch it. Diesel also works, or any of the spray engine de-gunkers. I also removed and cleaned the oil pickup, changed the rear crank seal, and used silicone gaskets on both pans.

It is possible that your compression measurements are incorrect. As example, some people mistakenly replace the Shraeder valve w/ a regular tire one. Compression gages must have a special one with a very weak spring (white collar usually). Try turning the engine over by hand and feel for each cylinder to test for good sealing.