Get a degree wheel...like the BIG one staring you in the face (the flywheel!). Mark it off at TDC, and ~ 20-24 BTDC. Get a dial indicator and a stand. Find TDC. Mark it HEAVY on the wheel, referencing something good and solid on the base.
Next- Find the START (0.050" rise) of the exhaust valve opening. Find the END (0.050" before the base circle) of the intake closing. Split the difference. Make your cam position so that the center point coincides with TDC.
Next- Set your squirt timing so that it STARTS to pump 20-24 degrees before TDC. (It may be that the factory spec is 18-20 degrees...)...but IF you can get 24-26 degrees BTDC for the START, then your engine will run more efficiently. I have found that IF you take a spare injector, and a spare high pressure line, and bend it so that it's attached to the actual pump AND lined up with the mark of TDC, then you can really hone in on the true timing....Make both pumps the same timing!