Hello. Just put a new cam in my 86 k5. Now the thing wont start. Timing marks on timing chains are dot to dot. Found top dead center on number one and indexed #1 spark plug wire. Adjusted valves. Still nothing. Checked for a spark and fuel in carb, both look good. This truck still has the factory computer HEI and Rochester. Would the new cam durations and the computer have a problem. Any help or advise on this would be greatly appreciated. Thank you.