Walmart Everstart at 525 cca. cost $29 and was fairly rated by Consumer Report couple years ago. ford Master Craft at same rating was $72 - both full replacement for 1 yr and then prorated. couple years ago VMFer di survey of battery experiences and there was good and bad about each major suppler so i reasoned that for $29 i would try it and it is 24F typw to fit mky '68 well. had it for 3 yrs in Buffalo, NY and works fine.
I refuse to ever mount a standard lead acid battery in my nice cars ever again.
Currently using a Gell Cell (Bought it at a 4x4 shop over 5 years ago -- can't see the name) and since then I've enjoyed no acid spatter, no leaks, no corrosion buildup, plus I can leave it sit for over 6 months and hit the key with no trickle charge. I will never use anything else.
The restomod will prob get an Optima.