if you go 7 mil cheeta with power valves get ready to put a +8 swing arm,billet clutch basket,on and on.but with the cheeta power valve you will have a much broader power band.if i was to do a street legal banshee which i know nothing about,i would do a 4 mil power valve cheeta,2 into 1 carb set up,and bunch of other shit i dont know about.and probably gearing is going to play a huge roll.also reliability has a lot to do with how well you are able to put your motor back toghether.you know new seals,make sure you clean your case good enough so that you can eat out of them,new gaskets,no cutting corners,or using any chinger stuff.good luck.