Nosram Pure Evo Stock 13.5

[oggdog]

Hi,

Am after some help regarding gearing for above motor using a GM 90 2010 speedo.

Can anyone give me some sort of idea of a starting gear ratio as am running this new motor on Sunday at Stafford and don't really want to blow it up and also any idea which timing insert to use with it.

Or, how about a ratio for a Novak Ballistic 13.5?

Many thanks in advance.