What heat sink to use on Neu?

My truggy is running Hotbodies 43/10 truggy diffs with a 46 tooth spur on it a la JHautz's conversion, this truggy is formely Jeffs, I bought it off him last year. I have all the numbers and ratios in a chart at home, unfortunately I am at work now so I can't look at it but I can post later if you guys want to look it over and let me know what you think, that would be a huge help. With no real chance of testing I am sort of going into this first race guessing. But I will have a few other pinion choices with me for tuning 13,14,15,16 probably.