impellor choice?

Hi .I`am just finishing up building my blaster1 which i will be mainly using for wavejumping . engine is a 760cc (gp760) with a b-mod pipe & atp head ,tau-ceti`s , what would be a good impellor for this set up & any other mods ,bored nozzzle ? extended nozzle? any advice would be much appreicated. Ian
 
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