3rd Gen hemi... same bell housing, can use the original trans if you wanted. They sell a bracket to attach the kickdown linkage now. Only thing you’d have to figure out would be motor mounts.
I have a decently built 408. With iron heads. The heads for small blocks suck. Period. What I would do is find a 3rd Gen hemi, you can buying a running car or truck with a hemi for less than 3k, swap everything over to the d150. The only thing you’d have to do special would be the motor mounts that way.
I wouldn’t. Everyone takes the easy way out..