Small Block windage tray ?

There are actually 2 early stock windage trays, 1 for 340 and 1 for 360.

Then there is the universal tray used in the '82-'92 applications, which has a slotted bolt hole pattern.
These slotted trays were usually found on 318s with the Police Package, but the 360 pick-up roller engine ('88-'92) also used them.
They are also the MP Replacement/Performance trays we see now.

The differentiation from 318 to 340 & 360 is the main cap bolts on a 318 are @ 5/16" shorter in length . To compensate, the head of the main bolts are that much longer, 5/16", to make the tray edges clear the pan rail.
This is done to compensate for the shorter main cap on a 318.
DO NOT USE 318 MAIN CAP BOLTS ON A 340 OR 360!!
They are too short and thread damage will result in torquing them!

The early 360 trays are very different from the 340 trays, as they each use a different bolt pattern.
The narrower patttern is for the 340s and the wider pattern is for the 360s.
From what I can tell, the single-pattern (early) 360 trays are slightly deeper at the center to allow for the increased stroke of the 360.

Mark.