Kevin,

Parts may have been changed over the years, leaving many of us with "Frankenstein" trucks (not monsters but trucks with a variety of body and mechanical parts).

Here is a link to a collection of distinguishing characteristics of Chevrolet Advance-Design trucks.

What are you block and head casting numbers? It is possible but highly unlikely that you have a 1953 (Powerglide) head on a 1954 block.

Tim