Who is "THE" custom cam guy?

There are a bunch of guys that cut custom cams from many manufacturers lobe catalogs.

Brian at IMM
Ryan Shady Dell
Mike Jones
Dwayne Porter
Scott brown was at straighline, he went somewhere else.

Pick someone and go with it.

I would NOT use any of the major cam manufactures unless you talk with someone in design, Billy Godbold at comp as an example, not the call center guys.

Stock exhaust manifolds need a wide lobe center to work well. I probably wouldn't run anything less than a 112 and likely closer to 114.