Dang! Sounds like an interesting build.
I don't particularly have any issues with the 351M/400 engines. The low compression, open chamber heads always seemed to be the Achilles heel of those. Now, if we were looking at putting a nice set of closed chambered aluminum heads on it, that'd be different. That would probably end up costing more than the entire build is worth, though.
I think it's still a good motor, it just has its own little world of issues. Kinda like the 6.0L.
Post pics and link to the video from the machine shop. Always like watching cranks getting balanced.
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