The credit switch should be first on the stack so it activates before the start switch in the button motion.

Or consider moving your credit switch so it's activated by the coin reject button instead.

Or better yet, get freeplay ROMs like Buzz said.

First question, do you have an EPROM programmer or access to one?

Post some clear pictures of your MPU board so we can see what ROMs it has and how the board is jumpered for them.

All depends whether the MPU board has the original ROMs or not.
Bally shipped 9316 ROMs at U1, U2 and U6 for Harlem Globe Trotters.
2716 are the same size as 9316, but the pinouts are a little different and they're not plugin compatible without changing jumper settings on the MPU board.

Regardless, the freeplay ROM only changes U6 resulting in the need to use a 2532 or 2732 EPROM and MPU board jumpered accordingly for u6.
The batch file looks for a factory U6 already converted to 2732 and then modifies accordingly and will fail without it. Since you probably don't have it, just change the batch file to look for the original 2716 size U6 and it will convert that successfully.

Or, you could find the already converted freeplay ROMs you need on the net...

If you want to leave the original U1 and U2 in place you will have to change jumper E13-E15 to E13-E19. Alternatively burn U1/U2 into a single 2732 (copy /b U1.2716 + U2.2716 U2.2732) and burn/install U2.2732 at U2 - jumper accordingly.

And then for U6 you need to jumper it for 2732.

Below pictures show how 9316A ROMs are currently jumpered, and the changes needed to jumper both U2 and U6 for 2732 EPROMs.
BY-35_Before.jpg
BY-35_After.jpg