questions about harmonic balancers

[1974ChevyC10]

i got a question about pioneer performance products harmonic balancers listed on page 118 of the most recent summit catalog-part # pio872003.this is the description summit's website says about it-Street Balancer, Int.Bal. SBC V8/ 90 Deg.V6, 8.01 in.Dia.(8.0), 3-Bolt-they say in the catalog there made with a procedure that heat bonds the dampening rubber between the center hub and inertia ring to prevent slipping and failure of the bonded rubber and there also bonded to OEM specs.reason i ask is because my uncle who built my new motor thinks the old balancer slipped since he couldnt get the motor to time right.there only 34 bucks more and if its not a big hassle to use one-like will i have to get new pullies and belts to use this or will it work with the stock pullies and belts.if there is no hassle to use one i will.has anyone used or know anyone who has used one of these balancers before and how would you rate them.i dont have 2-300 dollars for a race balancer and honestly my motor is fairly mild so i dont think i need an all out race balancer.lemme know what you all think.