Nice find 68 SportCoupe...
It looks like some sort of an Alsport but I don't know the larger model numbers too well.
Someone else will be along soon, to narrow it down further.
See if it's got all the pieces of the drive train, torque converter drive and driven, sprockets, etc, functioning or serviceable brakes...it looks like it has some sort of motor...the originals were larger tecumsehs.
The more of that stuff that it has, the more value it will have. But we aren't allowed to suggest values.
Shucks...feel him out, and work something out that makes you both happy.
Good luck.
Edit...sorry...didn't mean to be repeating what you said Jay ...:laugh:...your post wasn't there when i started typing..:laugh:
Trikes are a blast...:thumbsup: