I'm not a beginner in flight, just a beginner in prop selection. I can do fine with 2-blade, but I start getting confused with more blades...

I have a P-51D that was designed for a .46 engine - I have a .91Surpass on it and I have been chipping a lot of props due to clearance issues. As soon as the tail pops up I sometimes hit the prop - I have to be very careful when I throttle up and reach airspeed...

I was planning on moving to a 4-blade prop anyways for looks, but I realized that the 4-blade would be shorter and would give me more clearance... (wish I had figured that out about 2 props or so ago)

I'm wondering what would be a perfect prop for this engine in a 3 or 4 blade prop (preferably a 4-blade)... Any ideas?

--Micah