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the major diff between the two 413,s is the heads, if you inspect them the industial heads dont look anything like a set of street ones(452,906,915, etc.) Iaso believe that the reverse rotation cam was only on boats with twin engines 1 stbd 1 port the reason is for coter-rotating props.



Not all reverse rotation Marine motors were one of a pair. The single motor boats with Vdrive used them. Vdrive motors sit at the rear of the boat backwards with the trans and V unit going forward. The motors used a timing chain and reverse cam.
I hope the same cam the 413-3 with gear drive uses is the one used in rev rot marine 440s. I have a 413-3 gear drive set coming from a Moparts member that I think will allow me to run a std rotation cam in the rev rotation 440 in my Century Arabian19.
Any ideas as to whether a twin gear drive with a standard rotation cam will run a 440 backwards?