under the heater box on the firewall, right below where the blower motor duct is....there is a partial VIN stamped, it will be upside-down looking at it, so if you ever have to remove the heater/AC box you can compare the dash VIN to the one stamped on the firewall
sadly the only way to see it is by removing the heater/AC box or maybe by removing the blower motor and using a bore scope
another thing to check is the steering shaft at the steering box
if the end plate is welded on...it's a small block steering shaft
if it has a retaining bolt and can be removed...it's a big block steering shaft