/6 double roller timing chain set

Hello, Well here goes. I found info on what part#'s to get to install a double roller chain on a /6. Part #s napa s338 crank sprocket , s338 cam sprocket & 9-168 chain. well, installed. The parts fit but the chain is loose on the coast side, tight on driveside. Turning crank clockwise. Do i have the right set. Any help would be great:banghead: