Magnums have a short snout camshaft because they don't have a fuel pump eccentric. The sprockets and chains can be swapped but the attaching bolt and washer is different, all magnums come with a silent link chain.
As for the flex plate B&M should know, I don't.
"Follow me the wise man said, but he walked behind"
'92 D250 Club Cab CTD, 47RH conversion, pump tweaks, injectors, rear disc and hydroboost conversion.
'74 W200 Crew Cab 360, NV4500, D44, D60 and NP205 divorced transfer case. Rear disc and hydroboost conversion.
2019 1500 Long Horn Crew Cab 4WD, 5.7 Hemi.
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