the 36 degrees Feral referred to is total advance. that is, your base timing (eg factory spec 10 degrees as you said) plus mechanical advance. It can be checked roughly enough with a timing light by bringing engine revs up until the timing stops advancing - normally somewhere around 3-3500rpm. You may need to mark the crank pulley to approx 35 degrees and check it against the zero (TDC) mark, because it will probably run off the factory timing marks which may stop at 20 degrees or something like that.

race fuels (eg Avgas) can also require jetting changes before any extra power is made. Just plonking Avgas in for a dyno run without changing other things can make the car run worse.

smaller wheels won't affect output on the dyno. dyno measures tractive force it experiences and the speed it is turning at the time. smaller wheels will increase tractive effort (by altering the gear ratio, aka torque multiplier), but reduce speed by exactly the same proportion. power will be unaffected.