[Fast67VelleN2O]

I just picked up a 67 Chevelle 300 sedan I would like to clone into an L79 car. I have 90% of the correct parts to do this. I have 2 questions. One is what valve covers did this car run originally? 67 Z style chrome Chevrolet script covers or chrome 327 style covers? Also I am almost sure it is suppose to have an open element air cleaner. Not the dual snorkle as the earlier cars did. Any input is very much appreciated

Thanks
Matt