Determining proper valve clearance, on a custom build Options

[3liter914-6]

Almost 2 years ago, my brother purchased a 2270 for his 914. I installed it, but really haven't had a chance to run it until this week. On startup, there's a little ticking noise that sounds like a loose valve to me, so I wanted to make sure I have the clearances set correctly. It's been so long since I set them that I don't remember what spec I used, but thinking about it now, I'm not sure what spec to use.

It's a 2270cc engine built by a member of this board that I don't think visits/posts much anymore.

Here are the specs I was able to piece together from old posts here and elsewhere:

2270, 78.4x96, T1 rods - Scat I-beams. Reduced base-circle 163/86B webcam. 9.1:1
1.7L rockers, 911 valve adjusters, with about 60-thou taken off for clearance.
1.8L head with (48x38) valves

So, what spec do I use to adjust the valves? It's a 1.8L head, so do I use that? or...? I guess the question is, what determines what valve clearance you use on a non-stock engine.

Thanks for any information!