I use 1/4 line as well with either a pushloc or compression fittings for easy removal.
Reference points may very to some degree but off the top of my head
Wastegate (below TB/CARB)
Fuel pressure regulator (carb hat preferable toward the back of the hat where a clean sweep into the inlet of the carb/tb)
Boost vacuum gauge (intake runner)
Blow off valve (below the TB/CARB)
MAP sensor for msd 6al (below the TB/CARB)
Tigger sensor for my ams500 wastegate controller (carb hat) its on a pressure switch much like a hobbs switch

This was how my slant was setup and ill follow close to that same pattern on my twin setup. When i refer to below the carb/thorttle body im refering to the plenum inlet aera
Hope this helps