Don't believe there is an easy correlation between the old ampere hour ratings and todays CCA to know exactly which modern battery is a direct replacement.
Some use the Napa 7204 which is a bit larger physically than the original size used on the six but fairly close in size to the original size used on the 8 cylinder 41s. No idea if any or how much difference in tray sizes between the six and eight for the different batteries so that might be a consideration.
Many have also chosen the Optima 6v as a readily available and maybe easier to find 6v replacement. CCA rating is comparable between the two. John Ulrich
julrichpackard.com/battery.htm makes a new tray to adapt the narrow and taller Optima to the original underfloor space as well as a deeper tray for the taller conventional batteries.
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