refreshing an 833 hurst 4 speed trans

Any body know what to do or how to do it as far as how to freshn up an old 69 4 speed hurst.
Im doing a complete resto mod on my 69 cuda and figure the trans should get a face lift as well.
Any suggestions out thier? seems sloppy and loose when shifting and definetly has seen its abuse.
Thanks, Machine head Dan
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