ive got a 94 s10 blazer tbi im trying to replace the balancer.. ive looked at different stores, pep boys, autoaone, advance auto parts.. the issue is that the tbi is wither not listed, or is 200 bucks.. the cpi is 45 bucks.. whats the difference in these??

 

or does anyone know if a sbc 6 3/4 balancer will work for sure??