Dakota manifolds on LA J heads?

This is something into which I looked quite a few years ago. Memory's a bit fuzzy and I may be wrong here, but as I recall the exhaust manifolds changed in 1994 for the T300 Ram chassis. The newer design supposedly doesn't play well with the older trucks. The bright side is that the older manifolds have a larger output (2.25" v. 2.00"). I don't think Dakotas used different manifolds than the full-size trucks, but they changed at the same time.

By no means is this gospel--absolutely double-check me. I do know choking the output size down to 2" allowed them to later utilize "natural" exhaust-gas recirculation (reversion, really) and eliminate the EGR valve.