difference between long block 300d 1976 and 300cd 1978?

I was told that the long block from a 1976 300d could be assembled with the rest of a 300cd engine and there would be no "issues". At the very least I am seeing that the oil pressure hose will need an extension (the oil filter is under the fuel pump in the 76 300d). However, I am also noticing that the injectors and fuel pumps for the 2 vehicles are different... Does anybody know what issues I might encounter if I tried this 300d block with the 300cd valve head? Is this a terrible idea?

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