shovelnose:
Where do you have that D2 casting number as a 71 boss 351 listed? I am not trying to be an *** here but D2 corresponds to a 72 and the boss 351 was 71 only item and should carry casting codes no later than D1. The 351 HO is reportadly a boss 351 with hydraulic cam instead of solid lifters (also a boss 351 indicator). This could have a D2 code as could any 73 engine components that had casting used in 72. However like you say, nothing wrong with these other motors, and likey good power.
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