I need to replace the positive battery cable on my 76 300d. How difficult of a job is this?

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1972 220d gone lived a good life
1972 280se gone but not forgotten
1978 300D the best i ever had
1977 350se speed racer gone
1995 honda accord lx coupe victim of the growing family
1988 300e gone but not forgotten

Depends on your car. Could be a filthy, slimy mess or a relatively simple task.

Key thing. At the connection to the starter, spray the nut with a rust buster solution of your choice several times. It is not unusual for corrosion to develop at this point. If you try to force the nut off then be prepared to snap the lug to the solenoid. This means you'll need to drop the starter to replace it. PITA which can be easily avoided.

The nut can be accessed from the top by using an extension, socket and ratchet. Remove the air filter housing for access.

You can get it from underneath. Its a bit trickier piddling around trying to get the socket lined up but you don't have to remove the air housing.

Six of one, half dozen of the other deal.

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I agree.

It would also be a good idea to brace the cable, while breaking the starter nut loose.

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I've had trouble finding a 4 gauge positive terminal cable for a 300D. You guys have any tips?