I have seen Newells during that time period with the 3208 Cat, the 555 and 903 Cummins and the Detroit Diesel 6V92. The ones I have seen have all had Allison transmissions, typically the 65x and 7xx series. The 8V92 Detroits were available by 1986 and possibly earlier. The HT 740 Allison was commonly used with the larger engines at least by 1980 and on through the early 1990's.
As to which engine was best, there are Cat people, Cummins people and Detroit people. The size and weight of the coach made a difference in the performance. The 555 Cummins was not considered a speed demon.
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