66 Valiant Signet has a 360LA engine - what do I need to know?

So I'm tearing into the engine on my Valiant because the flywheel ring gear was split and just spinning loose. That's probably why my brother parked it in 1996. It turned out that the engine uses a 53020006 360 LA block. It's also a 4sp M/T. I pulled the engine yesterday and have the flywheel out. It weighs 27.2 lbs but there's no counter weight on it. The damper does have a counter weight between the v-belt pulley and the damper. I assume that it has the cast crank in it.

Do I need the counter weight for the flywheel or is it more of an issue for A/T? Here's a couple of pictures of the flywheel. There are no markings on it so I have no idea what it came from. The clutch is a Centerforce.

Thanks - Jim

49238820076_ca366c49a1.jpg20191218_083254 by Jim Harris, on Flickr
49238819666_bd73a372e7.jpg20191218_083232 by Jim Harris, on Flickr