Timing Curve on 360 in an RV

mbaird said
I am not home right now but I have the FSM for 78 Motorhomes and they do have 2 stage advances . Plus the vacuum advance.
My question about emmissions was because I wasnt sure if heavy vehicles fell under the laws at that time . I remember 3/4 and 1 ton trucks still ran leaded fuel into the 80s.
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It's a totally legit question, and why I don't want to guess what tweaks were done.
It might have been cat exempt in '78 (like the pickups) but may have met some emmissions requirements - especially for idle and decel - in addition to vapor recovery and PCV.