I'm having Ford Performance 1.94/1.54 stainless valves installed in "G" heads. Is a 3-angle/5-angle valve job recommended. Should it include cutting the seats and back-cutting the valves? Recommended angle? Without attempting to extract every cfm, are there any obvious obstructions to flow that should be addressed? At what point does valve shrouding become an issue? Joe, I would particularly appreciate your input.