ferrari 246 Gt motor rebuilding questions

Help needed this is my first dino engine..

I am doing a full engine rebuilding on my 246 motor and i would like to know if it is better to use the aluminum screw on plug in the heads or the brass type used by superformance. Dino parts in germany is also selling brass plugs. Did ferrari use aluminum plugs for cost saving or to avoid electrolysis?
Any suggestion where i could find original aluminum plugs.
I am thinking about purchasing CPS pistons from Italy . Does anyone have any experience with those pistons. The one on my motor had been replaced with new ones and the exhaust valves seem to have taped the pistons on the right bank. A friend of mine recently did an engine using superformance pistons and his machine shop had to machine the pistons on the exhaust side to enlarge the cut out...
How do i find infos about the profile of the standard cam shafts? The on in this motor look fine, but i am not sure they are standard, or that they have not been re profiled..
Should the bearing bolts be lubricated before torquing?
Thanks for your help..
Hervé