thanks guys for offering help. all advice appreciated.

the old chain was VERY loose. I didn't check if it jumped tooth, I just went ahead and replaced it.

It had had back fire problems before when car was cold, but after it warmed up, it was running fine. Until one day, when it was still cold, a loud backfire, then died.

Was able to remove #7 spark plug, but couldn't insert the compression tube, so I didn't check it and just put new plug in.

Cylinder Order:
Bank One: 1357
Bank Two: 2468

Firing order: 18436572


I haven't got the chance to pull valve covers yet, but I will.