cam selection

Mechanical is the way, the only way.

Clifford is/was in temecula [about 30 min from me] I used to stop ever so often and trip out on how much money he wanted for his stuff.
We had good conversations about the evolution in performance parts, but he came off like the clifford way was the only way as in what ever his dad said was law when it came to building/designing a slant 6, I just laughed and said so why are you loosing your all your overhead?
See business got real slow and the last I heard he's now selling out of his garage, which is where my buddy jeff bought 2 z240 manifolds from him.

As for there cams, they are/were made by erson and the price is just hiked.
Rockers you can get from rocker specialties or COX BROS.
Sounds to me like you might want the old .436 248* MP hyper. cam

And as for valve adjustments only about twice before and after break in then once a year, that is IF you put hardened seats in the head [both int & exh would be good but at least the exhaust].

What ever mild/performance cam you end up with you wanna at least have 145-150 cranking psi.

Have fun.