D21 what needs to be done to compete

   Yes and no, I did fail to mention I port matched  the exhaust manifold, the holes are far smaller then the ports on the head.

  What are the rules???  Roosa Master puts out 400 cc of fuel max, Ambac from 8030 on up puts out 625cc, A pump puts out 900 cc , P pump, skys the limit.

  Fairvalley Performance has custom 5 hole injectors.

   My stock 8050 with stock Ambac with cut delivery valve and 3lm turbo easily put out over 300 HP, dyno did not go high enough.

 Yep, I've seen this scenario countless times over the decades I've been involved with pulling. One very prominent case here locally; Eddie Horman (local farmer) Had brought a new 1466 just as they came out in the early 70s, That tractor never saw a day of field work in it's life. He was the top dog in the 9,000, 12,000  & 15,000 pound classes locally and got to also be know all over the NTPA circuit at the time. David Scott (of the Scott Paper family)  was a Massey man and brought a brand new 1150, thinking It's got a V-8 so it must be better. Then spent who knows how much for add-on turbos and fuel system upgrades along with many different sets of new tires and never ever came close to beating Eddie Horman. After a few years David Scott was never again seen at a pull and the 1150 was relegated to log splitter duty. I saw this first hand when going by his place.

  Even with the unlimited Funds, It can still come down to the drivers experience and skill. 

 The same goes for the many years I pulled a CA in the 2500 pound class in my area and dominated that class. I had used what I'd learned over many years of pulling with multi engine modifieds and It got to the point that no new people were getting into my class because they showed up with grandad's tractor right out of the barn and were lucky to get half the distances I could. and instead of learning and improving, they just gave up. Of the ones that stayed, they finally got rules passed to favor their tractors and I went to pulling Open classes.