Still a good motor to build?

I don't think they were ever a good motor to build for anything other than HD use, as designed.

The block, and maybe crank and rods are ok if you really want a small bore RB.

Other than the the rest is scrap. If someone gave it to you that would be a fair price, assuming they'd already pulled it too.

They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.