These responses are accurate. No one has posted information regarding a 1960 Chevrolet Truck Shop Manual on-line. I think I have seen the 1960 261 engine section on-line, but you have a 235.
You might have to resort to buying a used or reproduction 1960 Chevrolet Truck Shop Manual.
This has been triple posted. You will find that many people look in all the fora, or they look at the "Active Topics" post, above (then at "Active Posts"). There is really no need to post the same question in multiple fora - that results in partial answers and same answers in multiple places (and some confusion).