CAM TIMING Advance or Retard?????

[turboN4thGen]

im building my hot air motor now and i bought a double roller timing chain and a 218/218 comp cam. im going to be putting 15-20 lbs of boost and spraying a 50 shot on this motor...what would be best for the CAM timing (not ignition timing) my double roller goes -8 to +8???
thanks

 

[WFO]

i'd say if you have unported heads you could put it in a couple degrees advanced.that will shift your power band down a bit.if you have ported heads i'd put it in straight up as you will have the big end breathing to use it's potential.