In a few words, if the transom and the stringers are sound it sounds like a great deal. These boats (unfortunately) have a history of dryrot in the transoms. IMHO mostly caused by people mounting things off the transom and not sealing it properly. Based on your statements of the boats condition as long as the transom doesn't flex and there are no soft spots on the floor then I'd think it was ok. There are others on this site that have much more experience with these boats and probably can advise you better than I, but it sounds like a good deal to me. Pictures are always helpful in returning a good evaluation.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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