TTi step vs. 340 manifolds

God thing is, aside from rearend components, I have all the pieces to go for it. I have the 915’s, the LD340, and the TTi step headers.
The headers were for another project but that engine really needs a 1-7/8 race header so I’m just going to put them on Arthur’s Duster.
By all means if you got them use em. I would.