Jodel 120a performance
The LAA office may be able to help,although
there are probably several 'performances' as there will be several prop builders.
Another option is to contact a couple of 120A owners to check their engine/prop/weight config.
There are as many 'homebuilts' out there plus the Wassmer built ones.
The 120A can have a ventral airbrake, and the fuel tank situation can vary.