This is what ive got, 220D with a bad engine.. I can get a 300 engine for it, but its mated to an auto trans. Does anybody know if the flywheel will bolt to the crank on the 300? Will the old tans bolt to the 300? Are there any huge problems that anyone can think of?

You will have to shorten the driveshaft, shorten the shifter rods, alter the transmission support bracket, make a custom exhaust, relocate the oil filter housing and change the rear end ratio (differential).

In effect it IS a huge problem.

It would be easier to go with a OM617.910 motor which has the oil filter in a non intrusive location.

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k

What chassis 220D is it? W115, W123?

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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate

Sooner or later every car falls apart, ours does it later!
-German Narrator in a MB Promotion Film about the then brand new W123.

Most likely a W115, W123 200/220D's were not imported.

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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power!
1977 6.9 3(A) - 84k