As Bob and Jim have noted, it depends on what's gone before. If the crack is on the port side of the motor, generally in the area where the carburetor hangs, that's not uncommon, and is generally the result of a freeze-up. There are many good fixes on that type of crack out there, but also many not so good. If it's that type of crack, and the leak is only a slow seep, the epoxy fix could very well take care of it, as there's no internal pressure on the cooling jacket on the B. If it was a very bad job fixing that type of crack to begin with, it might be better to have whatever repair was done ground out and done over as in your initial thought.
If it were a stress crack, then you would need to go over the block with a fine-tooth comb and consider having it magna-fluxed to check for cracks in the webbing on top of the block where it mates to the head gasket, as well as the lower end where the sleeves seal.
Those blocks, though, were beefed up in the right places so that responsible use would not overstress their capcity as frame components. Are there any other repairs or welds on the block, like on the ears where it bolts to the front casting or the torque tube? That might suggest your crack could be due to stress.
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