You'll need to find a true TDC of cyl. 1 (don't trust the crank pulley) and mark on the pulley, at this point fit a timing dial to the crank pulley, you can buy these from most camshaft manufacturers, or make your own in a CAD package.
You'll then need a DTI on the tappet of cyl. 1 (either inlet/exhaust depending what the camshaft manufacturer quote) and they will give a peak timing in degrees of CA for that lobe.
You can measure where the peak lift is, and then refer to your timing disc on the crank to check against the spec. Rotate the crank back to correct position, and loosen the vernier and rotate the cam until the lobe you're measuring is at peak lift. Tighten it all up, if it's a fresh build, worth checking again after you've put some miles on it.
Remember crank spins twice speed of cam, and there's 720'CA in one cycle...