I bought "THE" block from Muscle Motors in march of 2017. I was happy and excited, they said the only problem you might have is putting in the cam bearings is very tight. That wasn't the only problem.
it seems I got an early run block, most problems were fixable, but it would have been nice to know of the problems before a lot of test fitting, then put it together and find something else and take it apart.
'Ol Dick Bradshaw may have fixed those problems by now, who knows. If you want an Iron block, it seems like it is the only one out there, it is heavy, at least over 305 lbs. maybe more depending your bore size.
If you want one buyer beware , I might go through "Best Machining" I think they know a lot about them.