Electronic ignition upgrade.
Phil Jacobs, founder of Jacobs ign systems, wrote a very good book called Performance Ign Systems. I have not used his systems, but those that have generally have positive comments such as better mileage & power.
The Chrys ign system did not fare well in his ign comparison, especially compared to HEI. Not that the Chrys ign does NOT have variable dwell; the numbers quoted are different ECUs.
Phil Jacobs, founder of Jacobs ign systems, wrote a very good book called Performance Ign Systems. I have not used his systems, but those that have generally have positive comments such as better mileage & power.
The Chrys ign system did not fare well in his ign comparison, especially compared to HEI. Not that the Chrys ign does NOT have variable dwell; the numbers quoted are different ECUs.