Seems to me that everyone should build taildraggers!
Doug, it all depends on what prop you want to put on your -360. As I mentioned above, my O-360 and Catto FP prop is lighter than an O-320 with a metal FP prop. If I put composite CS prop on it, I would still be lighter than a 320 with a metal CS prop, which is approved.
As you build, you once again have to go through the Q&A process to figure out which configuration, options, etc. you want in your plane.
As you pointed out, your -9A with a 160 hp (I)O-320 was a good performer. There is absolutely nothing wrong with that engine.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC