Scott I agree the GY 2585 is not the right choice , that is the that most of us new Gen JrFuel [ 6.80's to 7.0's ] running 400 ci alky burning 3.5 lb/ci all iron motors , and my team is going to try M&H 30.5x 10.5 [ 11.5] x15 and MT 31x 10.5 [ 11.25] x15 on 12" wide rims . The Mickeys and MH are at least 4-5 lbs heavier than the GoodYears. More rotating weight takes more power. The MT like wider rims like 12" but in your case 10" would work good on the GY or MH .
But I think your tire picks listed may be too big for your HP , our JF car is going to try 10.5 tires because we get tire shake , enough so we have broke a rear engine motor plate , cracked front steering mount, and a windshield. We think tire shake comes from not enough power or too much traction. With the tracks using more and more VHT the tires will dead hook , wind up the side walls and shake, The only JF team running a bigger tire is running and winning on MH 33x12x15 but he is making 1000+HP @ 10,500 rpm with a 5.38 rear gears. Twice what you are planning. The 2020 Comp Elim champ is a B/ND [ JrFuel type ] is also making 1000+ HP , but he is running the MT 29 x 10.5 [ true 10.5 "] x15 tire with a loose converter , my guess 9000 stall, so it doesn't hit the tires so hard . Which might be a good choice for you , or a GY 28x 9 or 10x15, unless you will be racing at no prep tracks with limited VHT. The reason FED want a little less traction is to keep the RPM up to where the motor is happy , otherwise it will pull the motor down below its power range.
BTW call Don Enriquez at Hilborn, he can help you set-up your FI , Don is a muti year JrFuel Champion , he has been driving dragsters for over 50 years
My Company Hayden Wheels are Goodyear and MH dealer and I could give you a deal. 805-444-4489 cell # Jon Hansen
