Perhapes if you can be more clear on exactly what your looking for??? I've read your post a couple times and I'm still not quite sure what your seeking. Are you looking to rebuild your current TR. Are you trying to upgrade it to an R-Spec? What?

But if your saying that the R-Spec and the standard TR are the same engine, then you've obviously never seen one of the run. See one run, then make that call...