I would look at the AVS ES100,Yokohama’s Ultra High Performance Summer @ $97 ea or if money is tight the Sumitomo HTRZ @ $87 ea, both at tirerack.com
Michelin first introduced steel-belted radial tires in Europe in 1948, with Michelin radial truck tires coming out in 1953. Goodyear finally produced a radial tire in 1977.
Back to the aero drag/lift... So i have read in a few post where the Z is suppose to have "X pounds of lift at 100mph" (usually around 60-120ls lbs) So i was thinking i had to get the air dam/rear lip spoiler for high speed stability but beandip's source's seem to say otherwise, anyway to scan the info beandip?
According to my Nov 1975 issue of Motor Trend with a 280z test, by then they came with: Toyo Radial Z 701 Extra 195/70HR14 So i would go with Toyo's maybe...
Saw some of your other pictures, ahh, Road Atlanta before they took out Gravity Cavity, use to road race bikes there with AMA/CCS during the '90's, love that track!!
Top =clean, shaved, no bumpers, spoilers or badges
Bottom = badges, bumpers, side markers, whale tail, frt spoiler
(thanks to owner of car for this beautiful Z to use as an example)