Flathead vs BSP gearing

How big of a difference?

Used to run a 13/63 on a flathead, where would a good start be on a BSP?
Clone is a driver size bigger for sure lot of times 2, F/H rear gearing is best from 62 to 66 the clone however seems best if rear is between like 58 to 62 maybe 63, 13/63 would be proper gearing at our track for a F/H and for clone BSP it would be 15-59, 60

Good Luck !!
 
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