Don,
the Conquest series were a Dave Patrick design (if memory serves) and I think they made it up to version 8 or 9. The early ones were piped 60 designs and as expected, the later ones would transition to 120 4-strokes.
If you search this forum, you will find photos and posts on 4-stroke Conquests. Rusty Dose, a prolific poster at one time, has posted on it.
David