I had two group 24 12 V deep cycle marine batteries in my Cuda and I would charge them for around 48 hours with a self regulating 4 amp trickle charger to top the batteries off before going racing.
They would charge up to 13.8 to 14.3 on the charger and would settle down to 12.6 to 12.9 volts after sitting over night.
The 100 amp Powermaster alternator would charge, show on the voltmeter,14.5 V running and the batteries would stay above 12.5V at the local 1/8 mile races at the end of the day. I would take that same charger and charge them during the long ( usually from 45 minutes to 1 1/2 hrs. lunch break that track took
That car did not have big electric cooling high amp draw fans on it as it didn't have a conventional radiator, electric fuel pump, MSD 7AL2 ignition and big electric water pump with a small cooling fan on one of the oil coolers used as the radiator. Not a lot of amps used to run that car
The starters on our car are the biggest amp draw on the batteries usually
We normally don't drive them long enough at the races to recharge the batteries after every motor start