I have heard good things about Dynamic, never heard of the others. You might try posting over at www.lakestclair.net as well.
Tyler Crockett is in Ruby, MI, which is not too far. Sterling Performance is in Milford if you want to swap that 454 with something with a bit more juice; Ilmor is also local (out in Plymouth) if you want to grab a V-10 instead.
I've had good experiences with Lenny at Millennyum Marine, though I've not used him for anything as extensive as a rebuild.