I am thinking of buying this guys car, it is a 1977 Mustang II Coupe..the only problem is that the interior is totally stock...so, i was thinking ok it is only $1500 so i could take the money i would be saving and getting it fixed up..but the only problem is i have no idea how much that cost..i would like to put in new seating material, new steering wheel, new gauge cover/plate, etc. things like that...how much things like those cost? the exterior is fine and the engine was just rebuilt so..that's all fine..