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Not sure of the bolt pattern, but there is a major difference, one has a hole for the mechanical fuel pump and the other does not, using a electric fuel pump in the gas tank.
Whats interesting is that the cam lobe for the mechanical fule pump is still on the cam & the bolt holes to mount the pump are there as well. All that needs to be done is to cut a hole for the pump. Probably a bit more work than you'd like to do though.
Edwin