Just to clear things up, are you trying to view a sinewave, or are you trying to see the marker pips on your oscilloscope?
If you are doing a alignment you will need a demodulator probe to be able to see the markers.
As Notimetolooz said 5.5 MC is the top end on that scope for examining a direct waveform. My Heathkit is around the same frequency range.
If you're using markers and a demodulator probe then you will have a far greater range.
World radio history has plenty of books in PDF form on radio and TV alignment that is period correct for the gear you're using. The Sams books and the Gernsbach books are excellent and I highly recommend them.
I would not recommend adjusting the IF cores until you have a full knowlege about what you're doing. Trust me I've been there and done that as a kid when I was just starting out and it is real tough to get everthing dialed back in.
SAMS
https://worldradiohistory.com/BOOKSH...shelf_Sams.htm
GERNSBACK
https://worldradiohistory.com/BOOKSH..._Gernsback.htm