318 build up

With futher investigations of the forged crank, I belive it came out of a 273. The casting numbers is very hard to see, but the two first ones is 21. According to my books that would be a early 273 crank.

The bearings do not look very good at it. A polish would not be enough. Then, someone has been welding the balance drilled holes in it. If a real enigne-shop has done it, that would be ok, I guess. But if someone did it at home.....