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IIRC a LA360/383/400/cast crank 440 can all use the same external fly wheel. I asked about this several yrs ago here and what I come up with. I also have a 77-MH cast crank 440. has the bullet nose damper on the front. at the moment I have a aftermarket damper that is N balance with a weight that bolts on to damper for a cast crank 440. and run a external balance 727 converter from a 77-400 van.

I did score a external balance flywheel for a LA360 engine to use on my cast crank 440 for a 4 speed some day. if I ever come up with all the rest but a flywheel is the first piece to start a project.

most of the time when searching I use a 77/78- 400B engine non a/c doge truck for reference at parts counter or for car parts a 68 road runner RB440 for HP parts. this works for what I want for the MH440 swaps.

like mentioned use a newer magnum engine pilot bearing. it fits the TC/crank hub just knock it in the big hole flush.

I would be searching for a 78 d200 400/435/d60 truck or 82 d350 360/435/d70 for finding a flywheel to use. as I find these combos are the most common in trucks.

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Sorry I'm slow getting back online to read this but this is really helpful info.

I was guessing maybe use the d200 truck as a starting point for these parts.

Thank you !!!