Never been to that track but if it’s about a 1/2 mile I’d try the 85 first then put on an 83. If it’s 1/4 mile I’d try an 87. If you feel it stop pullin’ 3/4 down the longest straight it’s about right.
If I remember correctly, I think I ran a 10/78 with a 3 pipe. This is about equivalent to an 11/85 or 11/86. So I think the 85 should work pretty well. I would start with the 85 and go from there.