Paul,
The bumper looks to be a pressed channel (round edges?). They were normally a square edge. That said, I've seen quite a few with the round edge; anybody know if this is correct, or 'home made'? I'm thinking the latter, but others will be able to confirm.
Short filler neck on the fuel tanks would be correct for the year. There should also be a large brass or white metal plate on top of the tank, which houses the gauge sender and changeover switch for each tank.
From the year of production, your truck could have had either rubber or canvas mudguards. Canvas ones are available from
http://www.canvasco.com/ in the UK. Some generic mudflap info here:
http://www.mapleleafup.net/forums/sh...hlight=mudflap
Can't say if your engine is original. The engine number is located of the flat area just behind where the distributor bolts to the block. Refer attached picture.
Good luck!
Owen.