I don't know about the HD's but I have the comforts and the way they control the car is amazing. Bilstein really makes the best shock for these cars, with the comforts the ride is stiff as can be. With the HD's these things would probably ride like an M3 with 19's.

These shocks really do take like 10k miles to really break in, so drive it for a bit and let them break in. If the fronts are original and you have the funds it would probably be a good idea to change them as well. These cars will pass the bounce test with shot shocks, and new ones will wake them up.

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2016 Corvette Stingray 2LT
1969 280SE
2023 Ram 1500
2007 Tiara 3200