Ok my son's 86 Olds 307 headgasket blew. So I had a 350 rocket out of a 74 Olds Omega .The 350 had points distributor. I took the distributor out of the 307 to install in the 350. My question is how to set the timming ?The engine runs but I'm not sure how to set the timming. The distributor has a big plug. Any help would be appreciated.