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you can install the larger 8" dampner, 8" is the performance version any way.
you might be able to look at the back of the crank, and see a forged line down the center.
forged crank is to look for the parting lines on the counterweights. A forged piece will have a wide, irregular rough patch. A cast component (shown) will have a very sharp, well-defined line where the mold was separated.
I went from the larger balancer to the smaller version when I did my roller cam swap, because the larger balancer wouldn't clear my cloyes timing cover with the button. I haven't noticed any issues.
The cloyes cover was a huge pain for this and other reasons.