Don't worry about cca. You want more reserve capacity.
Which is measured by the number of minutes a battery can support a 25 amp load.
For example my Home made solar inverter generator hybrid uses a group 31 with 205 minutes of reserve capacity.
It had a group 34 with 100 minutes of reserve capacity, but I wanted more.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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