Correct rod Part numbers, SB

hi, does anyone familiar with SB rod Part #s know what i should have here?

I have just pulled down a 318, it was a late model replacement engine (cast 1984 and assembled 1993) and the rods are part # 3418645 (pressed pin and cast crank)

The 1971 340 i have just pulled apart has the same part number rods but full floating pins as 340's do. It is a forged steel crank engine.

I have another set of 340 rods (full floating) i bought off ebay, along with another set of 318 rods, they are all the same 3418645 part number.

i thought that 340 had a heavier rod with a different part number? I know the 360 does.

Anyone with a book that tells what the part numbers should be for which engine, or if they changed through the years?

Author: Challengaaah