I inherited a 1976 bronco.Before brother passed away, he said he kept bending push rods. It's a 302 and i took a compression test, and #5 cylinder was dead. I took the rocker covers off and found a broke push rod. It has roller rockers on it but I don't know what cam is in it. What is the easiest way to identify the cam and what i have? Also, with roller rockers, I assume that it is a HO. How can I identify that and witch firing order should I use. I understand that there are two firing orders that can be used and that may be why he kept bending or breaking push rods. Any input would be greatly appreciated.