I've used this method before to advance cam timing. you cut the gear off the crank you want to use. then you take another crank and machine the crank away so you can use that gear. you cut a keyway in the crank and 4 keyways in the gear. all in a different position to a tooth. you can no longer use the timing marks on the cam or crank. you use TDC and split overlap. the gear needs to be a slip fit. when you find where you want it to be then tac weld it on. its pretty involved for someone who hasn't done allot of engine work. you could just call Kerber and get a #3 cam and a set of wide base lifters with 7 degrees of advance built in
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