" . . What year 235 eng. can I look for to install without a lot of problems . . "
Any 235 will install into a 1949 truck.
1. Use the 1949 clutch housing and clutch assembly.
2. If it is a 1955 or later 235 with the water pump body below the head, you will need to install a water pump relocation plate (from Pre '68 Dave).

" . . . can I look for to install without a lot of problems, would like to get away from the close driveshaft. . "
You will incur more "problems" and $$ accomplishing this.