Is the old 216 still in the truck .It should go in the same as the 216 is sitting ,but there are a few things to check here are a few that come to mind .Depending on the 235 and what it was in prior the front bracket were the front mount goes may need to be drilled ,two holes for the motor mount.The 235 will be longer requiring a adapter to put the older waterpump on making it fit without moving the radiator as well as cantering the fan to the rad like the 216/was origional.(unless the 235 is a 1954/55 model that has the older waterpump.There are videos of the adapter plate if you look as well as tech tips within this site and many discussions.You will also need to check clutch when you make the swap .Hope you meet your deadline for your wedding congrats will be a cool wedding with your grandpas truck.
