on my '78 550K. I got a set of 75(?) carbs 100 main 38 primary jets from a friend. Cleaned out the innards and cleaning up the outards. Anything I should be aware of? Bore is the same as the stock carbs, big advantage is these are adjustable. Originals are probably leaking air through/by he felt whatchacallits ... seals ... among other things. Any suggestions for jetting?