I'm sure you already know, hence the question. I'm unaware of any 385 to diesel/modular adapter.
I don't have the answer you are looking for, but supposedly you can mod a 460 ZF S5-42/47 to work behind an IDI, and a ZF S6-650 will bolt up to an IDI, so it seems that you should be able to make it work somehow
Zf-6 came behind, 5.4-6.4 gas, and 7.3-6.0-6.4 diesel. Do they all share the same bell housing?
Mod is same as SBF but two dowels are bolts and two bolts are dowels. Find someone who stuck a BBF in front of an SBF trans and copy that.
We haven’t found that yet either.
Why?
ZF6 is a fine trans, just not seeing the payoff over a ZF5 in a 460 truck
unless it's something awesome