Several things to look for. Hood was one thing. Air breather would also be there for W-25 and W-30. Aluminium intake with "Oldsmobile W-455" would be on one of the front intake runners and 'F' heads would be indicators of a W-30. A/C or no? Condition of the vehicle. Convertable will definately be worth more cash than a hardtop. Pictures man! We need pictures!
