Bought one for my son's valiant with a 5.9 swap. We haven't run it yet but i don't expect any issues in that regard.
My issue is the dual use provisions. it comes with plugs that we could not get to go into the unused bolt holes for the LA style heads. Probably supposed to be done with a press or something but if you don't have one... well I wasn't comfortable whacking on any harder then I was with a hammer. We're going to ream them a bit and JB weld them into place... or something...