yes SB and BB fan should swap

I got my JY 7 blade fan from an AMC Hornet,bolted right to the HD thrmo clutch and have had it on the SB and BB.

any clutch fan blade should bolt to the mopar clutch,IIRC

the 86 3/4 ton truck rad is taller and uses a metal fan shroud

it will bolt right in like the one you have but the top is above the core support,it has room under the hood and fills it up.

check your fan size as the AMOZON one is 19.5"...want to make sure it fits in the shroud...measure the mech fan balde thats on there and use it as a guide