I owned one of those back in the day and loved it. But it may be a sign it is time to move on to something more modern and reliable. I understand if you are using this for a nostalgic application it is very hard to give up, but otherwise there are better, safer and less expensive alternatives. Those old units had explosion potential you don't need to deal with today. JMO.
That being said, if you are determined, there are a few of these setting in garages in the Midwest. Maybe an ad in the transmission section of the for sale ads on Racing Junk might find you one cheap to use for parts.