Here is a list of a few upgrades to my early 260. A few photos are available in my user gallery. Production date: April 1974 Air box: K&N Lamborghini 3-carb filter in aluminum housing with Mikuni air horns Alternator: 60 amp Camshaft: Racer Brown SS-54-110 – 236 degree duration at 0.025†lift with 0 lash, 110 degree lobe centers, and 0.480†lift net, and valve spring/retainer package Carburetion: Mikuni triple side draft, 40PHH with 32mm chockes Cylinder head: Decked 0.020†Bronze valve guides 280Z intake valves, 0.173†dia. 280Z exhaust valves Valves and seats grinded Built by Floyd Link, Torrance, CA Exhaust: Header: Euro Car Anti-Reversionary, 1 ½†dia. tubing, 3 into 2, 2 ¼†dia. collector outlet System Dia.: 2 ¼†Resonator: Borla resonator Muffler: Borla turbo muffler Ignition: New stock coil New stock distributor Taylor 8mm Spiro-Pro NGK Iridium spark plugs Oil pump: ZX-Turbo unit Pistons: Datsun 0.040†over, flat top Differential: R180 limited slip, 3.545 R&P set, Bob Sharp Racing spare Transmission: 280Z 5-speed Good luck. Fixitman