It may "sound" ok but if the head is wearing down, it will affect the frequency response of the deck because of the newer contour of the head.
Odds are as well that all of the tape guide posts and lifters are wearing flat too and this all can lead to tape damage and excessive tape shedding and drop outs from less then perfect contact surfaces.
If you use this deck a decent amount, it might be worth getting the heads re-lapped by a competent service provider to re-shape the head back to a normalized shape and then reposition the alignment so that you get back normal tape to head contact pressure.
www.jrfmagnetics.com is a specialist in this area of service and you may want to contact them to get an estimate on the job.
Good luck!
Cheers!