So I got an answer, the VVL head can go on the RWD motor, and they say the kit works on a NA motor as well.
Looking at the parts required, this would be a huge money swap, several thousand dollars.
After the money put into the SR swap already this year, I think I want to spend less. I think I'm headed more toward my original ideas this year.
I'm thinking the S4 cams, and I'm thinking of trying to get one of the armonics
headers that's in this thread, and cutting off the 90 at the bottom and welding it back on in the right direction. (does anyone know if those are reasonably available? It looks beautiful, and it has to flow better than the stock Sentra ser manifold)
Once I get cams and a header, I'll look into a programmable ECU..