On my low-deck '72 with B-body headers, the left side plugs are easy and reached from above.
Since I have a motor plate and the alternator up high on the right, #2 and #4 are best reached from underneath. #8 is easy from above.
Notice I didn't mention #6 either :realcrazy: A 1-1/2" hole saw to the inner fender and it's a straight shot, just reach behind the tire :)