The ultimate, if money isn't an issue, is to weld in a system using these:
CP3985 - Light Weight Fast Aluminium Air Jacks - CP3985 Range. The Nismo RC uses the same thing in a 3-point setup: 2 in the front and one in the rear. The biggest one in the series has a one-foot stroke, and 3 of those big ones would add 9lbs to the car (plus air hoses and valves). It's not enough to crawl around under the car really, but it's enough to change tires or do minor work near the edges easily (e.g. reaching the front under-tray area or rear diff), and it would make it much easier to get a lowered 370 onto a lift for "real" work.
Seems like between the 3x jacks + misc other hardware, you're probably looking at $1500-$2000 to install such a setup though. This link has the Nismo RC sitting on its internal air jacks:
NISSAN FAIRLADY ZNISMO RC