Help to identify a 70 Z28

[Sportyworty]

I have located a local Camaro. The owner claims it is either a Big Block or a Z28 and does not know for sure as the engine/trans are gone. It is Fathom Green, has the weld on rear sway bar brackets, 4 speed hump, 8K tack with Redline starting at 65K, The tag is unaltered but being a Van Nuys car does not seem to help. The gas pedal is cowl mounted instead of floor? It is a deluxe interior and exterior car with the moldings and tall deck wing. The car is 3,000 bucks and is very solid and thought it may be a good first GM for me. I have been trying to brush up on GM muscle here but really only know my Mustangs. I like this car but not interested if it is not a Z28 and can afford a better car just like to work on them and this would be a fun challenge?? Any tips would be greatly appreciated. Oh also it has the longer pitman arm and a 12 bolt rear.