Well, HT roses that were intro'd in 1978 are:
Beacon View (no image)
http://www.helpmefind.com/rose...
Carina Superior (no image)
http://www.helpmefind.com/rose... white rose
Chelsea 77 (no image)
http://www.helpmefind.com/rose... pink rose
Chicago Peace climber (no image?)
http://www.helpmefind.com/rose... pink blend
Color Magic
http://www.helpmefind.com/rose... Pink Blend
Countess Cadogan (no image)
http://www.helpmefind.com/rose... pink
Countrywoman
http://www.helpmefind.com/rose... Yellow
Daniphyl (no image)
http://www.helpmefind.com/rose... red
Irene's Choice (no image)
http://www.helpmefind.com/rose... pink
Janal
http://www.helpmefind.com/rose... deep pink / almost mauve
Liverton Lady (no image)
http://www.helpmefind.com/rose...
Parador
http://www.helpmefind.com/rose... Yellow blend / tan
Patricia Miller (no image)
http://www.helpmefind.com/rose... white
Sybil Hipkin
http://www.helpmefind.com/rose... yellow
Vanamali (no image)
http://www.helpmefind.com/rose... mauve
That's from HMF. Each link has a little bit of info on each rose, most of them not a heck of a lot. If you think it's a J&P rose, then COLOR MAGIC (JACmag) is your best bet as that's the only one they intro'd that year according to HMF. It's an offspring of Spellbinder & an unknown (undisclosed). It's actually a pretty rose.. I think I have one in my yard somewhere in the back yard.