You need more amps at low speed which isn't necessarily the same as big amps at high speed. You need to dig one layer deeper and look at the amp curves for the alternators. Start by figuring out how many amps you need at idle. Turn everything on with the engine at idle and measure the amps being used. You might be able to solve the problem by turning the alternator faster with a pulley change. If you need a new alternator then shop for one that provides the amps you need at the RPM the alternator is turning at idle.
Andy, thanks for the help with the Sniper project on this same car. Runs good but Comp roller hyd lifters are junk. Great Race canceled for 2020 but the spending continues. We have 1. House battery in trunk. 2. 110v Smoke machine so we can throw a rod. 3. Yamaha 110v PAS DJ system. 4. 110v invertor. 5. Police lights. 6. Spotlight. 7. Dual Police PA system. 8. RV transfer switch etc and I am sure there is more. Fire Hazard for sure. Phish
