I replaced the cam on 400 sb. I thought i marked everything for the distributor like i was supposed to, but this was my first time so i may not have. Whats the best way to start over to get it timed right or any other suggestions on why it wont start. Ive tried slowly turning the distributor a few degrees in both directions and nothing. Rockers arent to tight, i loosened them, and it is getting fuel. Also does anyone no what timing degree its supposed to be set at, it did not have a timing tab. Thanks...