Stock battery was a "Group 24". Assuming that if you are looking at the battery from the FRONT, the posts would be at the rear corners, Positive would be on the right and Negative on the Left.
There is also a Group 24F (for Ford) where the terminals are reversed. Looking at the battery the same way as above, Positive is on the left.
If you wound up with the wrong "24", flipping the battery around would put the terminals where they belong, but the cables might not reach. Sometimes they do, sometimes they don't...
There are other battery groups that will fit, but the one called out for was Group 24, the good old standard work horse of the day for trucks. The other battery might have the same width & depth, but might not be as tall or could be taller.
I put a dual battery tray in my Jeep. There's a 24 & a 24F hooked up in [s]series[/s] parallel
. That way the cables are shorter to connect them. In the picture below as you view it, the 24 is on the left and the 24F is on the right.
Because the terminals are reversed the 24F, they line up with the same poles right next to each other making for shorter cables.