Crank pulley on a 225

My son & I are doing a spruce up of the slant 6 & want to remove the crank pulley to claen up 42 years of grime & then paint the front of the engine.

There doesn't appear to be a crank bolt.

Is this true or is the hole just packed full of crap? If there is a crank bolt, what size is it?

I assume one uses a standard harmanic balancer/steering wheel puller?

Any feedback from experienced slant 6 "wrenches"?