Hi Steve,
Yes, they should be playable, get as much dirt off as possible first obviously!
There isn't usually a problem with old domestic tapes, it's professional ones from the 80s that give most trouble.
The main question is whether you need a 2-track or 4-track machine (speeds can be corrected in software if necessary).
More info here:
https://www.vintage-radio.net/forum/...d.php?t=103289