28oz balancer for a 351w (302's take a 50oz stock) unless you're going to spin it high RPMs, then i would balance it internally..
I've got a 28oz SFI balancer that I'm selling ($125) and I believe I still have my 157 tooth JW "The Wheel' (also SFI rated) that I'm selling for $100 that was used in the same application. Let me know if you're interested via PM or email.
Derek
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