Battery cables and battery choices

[AnlaufJohn]

I am needing a new battery. The old one was in the truck when I purchased it. It is now 8 years old and struggles to spin the starter, dropping down to less than 8 volts when cranking. I used to work in a shop, so I understand voltage and amps, so the best I can describe its behavior is of a tree that has a rotten core. Hollow inside, but strong bark on the outside.
This battery is side-terminal and I wonder if I should change over to top terminal, just because that's what my 1966 C-10 would have had in it back in 1966?
The side-terminal design lessens the acid corrosion at the terminal, and I want this to be trouble-free.
I know the Group 24 will fit, but an option that presented itself when I called about batteries was a dual terminal battery, one with side and top terminals.
Ooh!! The dual is a group 78 and is a bit shorter, so it will still fit.
My question to the forum is: which battery and which terminal?
Group 24 is top only, Group 78 is dual, thus the choice.
Thank you,
John