Hmmm.. that's going to make it kind of tough. SOTP AFR is not an exact science. lol
Run the pump up to half and drive it for a while... if you see smoke out the back end then turn it down in small increments... when it stops smoking, turn it down another imcrement and leave it there.
For the spark... turn it all the way down... if you hear the throttle breaking up then turn it up until that condition goes away.
That's the best I can do until you're able to get it on a dyno or get a meter.