The four screws on the valve cover says '54 and later, which style water pump??? The numbers that will really tell the tale are 'cast' on the block down near the fuel pump. Also on the side you'll see date code then get all the numbers off the head.
There are charts posted here also on www.inliners.org site.
Best of luck

It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed