The IC core is too big for starters. It'd require more than machining the LIM and the SC outlet. This know because I've seen a few M62'* off the engine, as well as a ZZP SS IC.
Also, you'd have to put a thicker frame around the IC core as the LIM valley on the Series I sits abit higher (shallower) than the Series II LIM.
Fuel rails on the other hand, probably wouldn't require modifications.