I have an old bread truck. 1973 p400

I am trying to find a clutch assembly for it and i was told advanced auto would have it. when i checked with them the only P series truck they have is the p350. I was told the p350 clutch assembly should work with it but i am hesitant. please advise before i purchase this item please.

my VIN #: P40BVS35337
TRANS A
AXLE 28A
WB 154
DSO 870852
AM1 83-72092473

I need more information on my truck please so i may get the correct parts. if anyone has a link or part number from autozone, napa, or advanced auto or another place please help me out. thanks.