I have a Denny's HD steel driveshaft in my 67 Camaro and it has taken everything my 525 hp 406 has thrown at it with no problem. Lifetime warranty on U-joints as well.
https://www.dennysdriveshaft.com/c2_...iveshafts.html
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Camaro, 'Cuda, Super Bee, Duster, Blazer and some trucks
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