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I used the DOT plastic air line. You will be glad you did. It is easier to bend and snake between things. Just check and double check its not rubbing or can get caught in anything that spins.
I can tell you that the cummis 444 and 444XT were great motors. But Injectors were very expensive. And be sure to run the overhead every 100,000 miles. I like it and wish I could get my hands on one.