Great question, if I knew the answer it would be even better There are no markings on the cam, and no color of any kind either. I would not know the nuances of one versus the other to know the difference. Its funny though now that you mention it, It ran a little better initially , but I heard tapping from the #2,4and 8 cylinder's valves the first time I ran her. At that time it idled better , but the pressure was still low. I could not take the tapping, so I pulled the valve covers and commenced to do the ol twist and tighten method. the first time I knew I was over tight as I had oil blowby, I readjusted again and got rid of the blowby. Now it definitely struggles to run. I had half a mind a few days ago to throw on the 305 heads I have that I know were fine when I pulled them. I decided against it because they are the nasty GM swirl heads and although they were ported about a year ago, I did not honestly feel I would get much benefit from them as the valves are 1.84 / 1.5. Not knowing my cam has left me uneasy to begin with, throwing a different set of heads on could further worsen my dilemma.
Is there a way to tell via casting what the cam type may be? like cranks?