Jimmy,
Post the engine serial number (pressed into the block to the rear of where the distributor goes into the block).
That code will tell you if it a car engine (with hydraulic or mechanical lifters) or a truck engine. The code will also indicate if a truck engine is first series or second series. The 1955-1st and 1955-2nd series truck engine have different water pumps and blocks.
There is a 1955 Car Shop Manual. There is also a 1955-1st series Truck Shop Manual Supplement for use with the 1954 truck engine; and, there is a 1955 (2nd series) Truck Shop Manual. Which manual did you order (vendor and part number)?
The set up for the main/rod bearings are described in the Shop Manual.
