Brainstormin' 440 vs 5.9 ...

You want the BB, just do it. Said it in the thread. Always planned on a BB for it.

Port the iron heads, 509 type 108 lsa cam in at 100-102, headers, RPM/street dom intake, 1-2" super sucker and a true 850-950 carb.
Heads will make it go... they (oem) are the choke point.

Good 3000-3500 converter (likely most important piece)

Go have some fun with it.
Yep! It has either a Torker II or Street Dominator on it now. Can't remember, but seems the later now. LOL For starters.... Converter will be the one behind the 5.9 now. Carb will be the one on the 5.9 now. Who knows what I'll decide over the winter on how much I'll spend. May throw it in there as is for starters just to see what a smogger RV 440 will run in a D150. Could I push a 13.9 out of her ??? LOL