Hi
I can't add much to this discussion as I've never had an early block.
However, I do know there must have been a re-design of the cylinder head from the original silver one to the later black one which allows a distributor to be used at the back of the head.
I don't know how it relates to the head fitting on the block, but the cam cover of the earlier head is about 10mm longer than the later head, indicating that at least the tops of the two heads are different sizes.
If it is a problem you could probably use the old head too and just add the later FI inlet manifold and LH2.4 sensors etc.
Tim
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