Initial timing

I know I have a similar cam shaft In my 340, 18* Advance In my Distributor and was told to set it at 2900-3000 RPM to 35-36* which gives me a about 17-18 initial at 900-950RPM which where it seems to like it. Had a problem With preigntion was clicking a little around the 2300-2500rpm range but disconnecting the Vac advance and plugging the Vac port seems to have cured it but last tank ran some Lucas Octane booster and ESSO premium but trying to not have to Use the booster If I Can Thats what I have experienced D