Boat Maintainance

Howdy Yall' Just bought a 92 Fiberglass bassboat. The carpet are all original and in fantastic condition (was always stored inside) Some of the areas near the lid drains and places where the carpet width is small have started to come unglued. Can anyone suggest the best glues or epoxies to use for this repair. Also I am kinda surprised at the size of the gas tank. I measured it and figure its over 14.5 gallons (3360 cu in.) probaly a 12 gallon tank minis the ribs and stuff. Don't ya think that's a little much for a 14' boat with a 99' 40HP 2 Stroke Merc . Any input would be helpful. Gettin this boat ready for CCL next spring gonna save my 11' PRO 120 for the electric only lakes. THX ev1 still plenty of good fishin' left !!!! (just wish this weather would let up a little)