I have a couple old air cleaners circa 1970-73 and both are 4bbl bases, single snorkel and a duel snorkel missing the vacuum pods. I was wondering how hard would it to be to covert them into 1970-71 340 un-silenced air cleaner? I’m out of those and need one for a driver project for one of the club members, but they can’t afford buying a real one. Anyone make one or are the air cleaners too diffrent to do the conversion?