I guess I'd have to ask "what year of LA 360??". If it's the roller block 360, I'd take the 360. LA roller 360 with 308 heads would really put the squeeze on a 5.2 magnum.
Either engine is a great foundation for a build. My '89 D150 with a TBI 360 ran a better time than most Dakotas with 318 magnum.
