Yes it's been done with a R-154. You need an adaptor for the pilot bearing, you need to convert over to a Dakota hydraulic clutch, and you need a clutch disk to work with the Dakota clutch that's splined for the R154.
I think there's a thread here as well. Neither of the above links were for use in an A-body or even a mopar, both were mopar engine swaps into other stuff. But they cover everything for making the drivetrain work, just not the tunnel or crossmember stuff that might be needed.
