For high RPM sport flying and general warbird style flying the 13x6 APC will work great. (But they look a bit small on a warbird IMO.)For slower flying with less RPM you could go with about any 14 sized prop. I have used 14x6 , 14x7 and 14x4-W. For 3/D go with the 15x6 APC. I've flown my Spitfire with this prop and had great slow speed torque handling but lost some RPMs.
I'm getting my VectorFlight Edge-540 setup with the 91FX as I write this. I was running a Saito-100 with the 15x6 APC and it was plenty for general sport flying but I think the 91 will give me alot more speed and vertical performance in an 8.LB plane.
Besides it's not really a 3/D style plane.