I'd email roy for a list of parts your motor will need. leave your phone# and Roy will call you back to go over recommendations.
that gunk is likely EGR crud,
the IP comes out without removing the chain.
If you get your original head rebuilt (assuming it has no cracks...) you can put it on your replacement motor.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!