Online 6 cylinder info seems hard to find. A Hollander Interchange Manual could tell you just what you have, but mine only goes to '72. With only limited info online, I saw CCA as a 250 in a '73 Nova w/Powerglide and as a 250 in a '77 Nova w/TH350. You can also find date codes on many of your engine parts. (Example *A173* = January 1, 1973). List your date codes and we can help you further.
