With POINTS you can be sure of five things:
- the rubbing block will wear.....
- the ign timing will then retard....
- costing power & fuel economy....
- if the engine is a high[er] rpm engine, points may bounce causing erratic timing & power loss...
- points contact surface erosion causes cyl-to-cyl timing variations.
None of the above defects happens with elec ign.
A word of caution using the GM 4 pin module with a high rpm engine. GM used adaptive dwell. At low rpms dwell is reduced electronically because there is more time to charge the coil; this reduces coil heating, which reduces power loss in the coil. My understanding is GM uses a feedback cct using the p/up coil as part of the f/b cct to control dwell time. The Mopar p/up is a lot lower resistance, usually 150-300 ohms, where the GM pick up is much higher, about 700-1200 ohms. This [ ign coil saturation ] may be an issue at higher rpms, more at:
www.worldphaco.net
Another benefit of elec jgn is spark plug gap; probably limited to 0.030" with points. GM HEI used gaps of 0.060 & 0.080"; Ford elec ign used 0.060" gaps.