I fixed your link so it will open.

http://s828.photobucket.com/albums/zz208/catzsnot/1953%20GMC%202%20Ton/


Cab parts are the same as a 1/2 ton. A 1952,53 455-30 should be a 197 wb born with a 302 which seems to be in keeping with the Holley 3 bolt pictured. You will be lucky to get the cab watertight. My father used to remove the floor mats because he figured they were going to leak and moisture under the floor mats and rags in the cab corner is what causes rust.