gearing advise with a x12 10.5 in bmax 4

[09 lex 250]

hi all want to try this motor out this weekend at the local track on sun. i currently have a 84 spur and just want some opinions as to what size pinion to throw on there. i know the motor recomends 8.0 for final drive on this and the trans ratio is 2.35 to my knowledge. if there is any suggestions that you can help me with it would be greatly appreciated

thanks

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