If I may put in my 5 eggs.
When you use hole behind the barrels, there are two slots in the flywheel.
One is at TDC and the other is the timing mark (38 BDTC).
So initially, you need to find the TDC slot using a stick (long paintbrush handle or similar) in the plug-hole to verify you are in the correct slot. Careful...dont jam the `stick`!
Then put it in gear and rotate the rear wheel backwards to find the 38 BTDC slot. [It may be neccessary to rotate further and then go forwards to take up any backlash]
When the timing mark is central in the hole, the alternator timing mark should look look something like this:
And if you had a Sparx kit, it should look like this:
Then when you start the engine, using a strobe you can adjust the ignition stator (above) for fully advanced on the alternator at high revs...whatever is recommended for your kit.