Look at the back of each balancers and MAKE SURE the balance weight is the same size. I don't remember what the 89 is. If they appear to be the same, no problems. The 50 in oz is almost double the size. Need anything else, let me know.
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66"GT coupe
351W
T-5 Trans
3.89 9"
Ground up and just needs paint and the easy stuff.
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