72 Duster Resurrection

Just an FYI, KYB gas adjust shocks are listed at rock auto for A body mopar half what you would pay for em on ebay.
Random question on those KYB's, I bought a 72 Demon off a guy 2 weeks ago and it had KYB's all around. Are they decent? Will I need to swap em out when I move up to a V8 or can I still use em?