Performance comparison C85 vs C75.

My 415C has the 75 hp with fabric wings. Virtually all of my flights are
with two people plus stuff. Take-off is airborne before the 1000' mark.
Call it 900'. Climb is 400'+ depending on outside temp. Cruise is
95-100 mph, more on the rare flights without my co-pilot. Max altitude was a struggle to 9000'. For Las Cruces New Mexico
convention wanted more altitude. Changed the prop from a 7351 to
a 7347. Climbs easily to 11,000' with cruise speed and climb rate
essentially unaffected. Performance numbers I gave were with the
7347 prop. I like the 75 hp engine. Does similar to the 85 hp on less rpm and with better gas milage. Do wish it climbed faster (doesn't
everyone?)

Probably selling my ERcoupe 415E with a high time C85-12F engine.  Considering a very nice looking 1946 415C with a C75-12F engine, LSA 1320 GW with fabric wings.  My ERcoupe has the Metalized wings.  Just curious of performance difference between these engines?  I particularly in take-off and climb performance?  Any comparisons will be appreciated.  Thanks