I sold that dsl motor complet &amp; running to a friend of mine who's family has along history with olivers. He ran it for a while in his 880 untill he felt the need for speed &amp; built a 310 dsl for his 880 &amp; ran light open class.  he  then put that motor in a old 88 truned down the rpms &amp; ran it in antique class. That motor did very well in all 3 tractors If you prefer the slower pace pull. I just had more fun running in 5th gear insted of 2nd. The thing to remember is what you think you are gaining in hp by sound &amp; what you are truely gaining on the dyno are two different things. I had my own dyno plus I worked at a implement dealer with a new dyno. that tractor had more time on the dyno than it did on the track or field. I would say before you go too far start out by making sure you are at factory HP Then when you make a change &amp; dyno it you will know if you gained or lost  start a note book &amp; keep track of what you have done what gained ,what lost &amp; what stayed the same. If you need more help or info I will be glad to help.