I am just putting together the bottom end of my 340. I have the ARP main stud kit for windage tray (ARP 240-5501) There are 5 studs that have the extra length for mounting the tray, but my stock tray only has 4 mounting holes. Are there other trays that have a 5th mount hole?? Is there a preferred location for this stud that isn't used for the stock tray? And last, there are eight, 6 point, deep nuts, and two, 12 point, shorter nuts. Can I assume the shorter nuts are for the 5th/main cap? (And i already know about the stud under the oil pump not fitting, needing trimming etc). Thanks

It's been a while since I used a ARP stud kit on a SB Mopar, no way the studs would work on the # 5 main cap under the oil pump side. I don't remember if that kit had 4,5 or 6 longer studs I would work on the # 5 main first and not worry about the others until that was ready to run

Windage tray mounts go on the #2 and #4 mains...
only the 4 bolts... if you have 5 they screwed up

the last arp main stud kit i bought had 5 in it too...cut the 5th one off..