The timing really should be set, not just moved in a cut and try approach. It's really not too difficult to do with the drip method. All you need is a drip tube or you can easily make one with a junk yard injection feed tube.

Turn the engine to spec (I think 22 BTDC on your) remove the number one injection tube, remove the fitting below and temporarily remove the little cross shaped plunger below the fitting and replace the fitting. Put the drip tube on the fitting and loosen the IP mount nuts. Pump a little hand pump pressure and see if it drips about one drip per second, if not turn the pump to a position where it does. Now put everything back together and don't forget the little cross shaped plunger.

Hope this helps,