Wille:
Your 71 Nova SS model 11427 came with a 350 CI 270 HP motor. May I suggest two very informative sites that may help you with you information and research:
https://www.gmheritagecenter.com/docs/gm...vrolet-Nova.pdf
http://www.novaresource.org
Paul
If you'd like, send me a pic of your trim tag to :
[email protected]