[6pakdave]

Make sure it has a fendertag in place. The vin numbers are found on the dashpad,fendertag,engine pad,trans pad, drivers side of radiator cowl, top of the firewall cowl on drivers side near the cowl screen and the door decal. Vin or partial vin numbers should all match. The fendertag will tell all options eg E55 for the 340.
340 car will have the 8 3/4 axle. H code on the Vin for 340 [G 318] Im pretty sure all 340 cars were 4bble so they would have the bulged "R/T" hood. If the location allows, take your wireless internet,you can decode while your there.