So I think it is going to be one of these part numbers, not sure exactly which one so any help would be appreciated.

6424793
6424794

Vikki sent me this page to help me.

http://thefirstgensite.com/library/partscounter/number/fec/fec15.jpg

I have a 326, 2 barrel carb, non-Cali A.I.R., automatic Powerglide, no heat riser parts on driver side manifold, push on air breather on pass side valve cover (non oem valve covers) and push on oil cap on driver side (again non oem valve cover) and guessing it is a standard and not HD