Restoration Goals

My plan for the Mach (subject to change) is to do a  "restomod-hybrid".  I want to keep the original look Inside and Out.  (Why mess with a good thing?)  But I do want to modernize the suspension and drivetrain.  I'll be looking to the audience for experiences and recommendations for the following:

• Coil over suspension kits
• 5 speed conversion from automatic
• 351 Windsor builds in the 450 HP range
• A/C install.  Car did not have factory A/C but I have factory parts.  Looking for recommendations for vendor to complete the setup with modern components.
• Power Rack and Pinion kits
• Power Brake conversion

The list is subject to change but hopefully this can be a forum to get ideas and suggestions.