340 with air takes a special bracket with idler pulley as seen in the first picture when it has manual steering. It was left on tis motor when power steering was added . It is needed to run the water pump without power steering. Very hard item to find. I sold one to a member on this site. I have two left and they are not for sale. Good luck finding this idler Very Very rare item.
View attachment 1715895199
View attachment 1715895200