Found this calculator and run some numbers from my mopar 1/4 mile time slip,0 to 60 mph in 3.1 sec .69 g,s at launch.Numbers entered into the calculater were very accurate to my timeslip, 11.732 @115.18 mph
Wallace Racing - Automotive Calculators
Jason,According to the MSA parts catalog your 280 strut assembly,s should bolt in to the 260 2+2 chassis ,also 2+2,s have the r200 diff, and the stick cars have the 3.36 ratio vs the auto 3.54
Jason, This 260 looks like a project worth checking out http://toronto.kijiji.ca/c-cars-vehicles-classic-cars-1974-DATSUN-260Z-PROJECT-W0QQAdIdZ92947490