When I put the newer style carb on my 89, I tried it with the old boots and it did not run well so I bought the newer style boots and it ran pretty darn good. If you go that route you need to cap the small nozzle on the engine side boot. If your airbox is inoperable, I can’t offer much guidance. I have seen guys use pantyhose material to cover airway openings. Good luck and cheers.