Re: quick balancer question
Re the link to Rockauto above. They currently list among others, a PIONEER DA2621 for a shade under $63, you'll always also find a discount code to save a couple $ somewhere on line.
I believe but will always stand to be corrected on this though, is that one issue with using a sbc balancer is that the timing marks on the timing cover are usually different to the 4.3, so tdc dosent align with the timing mark.
As long as what you choose is the same outside diameter, neutral balanced, clears the timing cover and you can align/shim the crank drive belt pulley with the rest of your set up it should work. You will just need to determine where tdc is and mark it on the outer ring.