currently i have 118k miles. want to put a kenne bell on it but am afraid of breaking stuff with the miles. should i get a used pi short block and get some nice heads/cams and use the intake plenum, throttle body, cai etc. or do all that to my motor now but rebuild the bottom end and if i do that should i stroke it or just bore it 30 over. if you have any prices to compare that would be great as well.