Whelp looks like I'll have to reexamine my carbs. Not by them right now but pretty sure I have the 78 style bodies with the 5 ports at the mouth, and I know they're connected with the hose between them.
my slides are the angled ones which look likw they're for the 70-77 and earlier body, the needles are earlier and are retained with the plastic disc like the 77 and earlier slides would be. So the 78 502 needles won't fit since they're too long or so I've read. But are the needles too long due to carb body differences or just the needle jet differences (basically do I just get 502 needles and matching needle jets for the 78) 80 and new had flat slides, but I can't seem to find any pics of the 77-78 slides. Are they the same but different needle holding components? Guess I'll have to check my bowls for early or late style, and all my jets for sizing.
Also answered one of my questions on the float needle. Seems the rubber one is for performance carbs? Any benefit to using these instead of the metal ones, and can they be used with the same needle bowl fitting?