'78 LA cam thrust plate help...??

The bolts with washers are not original. They should all look like the other 2, but should work. However, there should be a little plate that one lower bolt holds and a tab at the other end of the plate fits into the opposite lower hole. This plate helps direct dripping oil on to the timing chain.

It's been a while sice I disassembled a complete OEM block. But I think the all come with the oil-directing metal plate. Not sure how critical it is.