The 400M was based on the "Cleveland" series of motors, not "Windsor". It has the extended timing chain cover area already cast into the block, as the 289/302/351W has a separate piece. The 400M was a real dog back in the day.
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I thought the 400M was a 400 Midland.. similar to the 351 Midland
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. I've never heard of this motor? This motor is based of of the "Windsor" series, not "FE" family for sure! Look at the heads (exhaust ports), the valve covers are totally different, the fuel pump, etc.
The items you would have to change are the headers, possible
oil pan, clutch, flywheel(neutral balanced), side pipes possible, misc. hoses, etc. I installed a 351W instead of a 289/302 and the changes were minimal. Their just a fatter and taller motor. Good Luck, Matt