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Some thoughts: Your audio may be the only thing out of alignment. You may want to tune your professional channel 8 modulator to channel 3/4 and see if those channels look good now...If they do then the tuner is probably fine and the old modulator was at fault.
If you have a Blonder Tongue AM series modulator fun fact: the IF out on the modulator (that loops back to the frequency converter/IF in on the modulator) if the same IF frequency as used in Color TVs. You can check your IF alignment by unplugging the IF input lead from the tuner and connecting it (via an F-to-RCA adapter) into the IF out on a Blonder Tongue modulator...This scheme will bypass the tuner (and any issues the tuner may have) and show you how good the IF alignment really is.
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