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Next question relates to Lawrence as an answer- yes, the sig geny certainly has AM, and its output is digitally rendered into a little 'scope screen which displays it's shape and amplitude - question is, what level would I inject?
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Typical old style AM sig gen would have been 30% modulation at 400Hz, eg: an Advance E2 sig gen.
Set the output level of the sig gen so that the receivers AGC is just below it's operating threshold, that way your aligning at maximum gain, the Trader sheet for your receiver indicates where to inject and where to apply damping.
If your doing the Osc/RF alignment connect the sig gen to the antenna socket via a standard dummy antenna, this should ensure that the tracking aligns as designed if all's well, you can also try to align to the antenna by wrapping the sig gen output a couple of turns around the antenna lead but sometimes (depending on the antenna) the tracking might not line up as intended.
You can monitor with your 'scope no problem, anywhere in the signal path between the wiper of the volume control and the loudspeaker should do, if you feel the need to disconnect the loudspeaker make sure a suitable dummy load is connected in place of it.
Lawrence.