I have a Mopar vacuum advanced/electronic/distributor in my rebuilt 440, The timing now is set at 25 initial and 36 total all in at I believe 2,300rpm's. I was informed that I should re-set it at around 18 initial. I have a little bit of knocking going on at medium throttle, and sluggish out of the hole but takes off great after cruising along. Can I adjust the slot/distributor with it still in the car or do I have to pull it out of the engine. I had help with it before, but just can't remember? Any instruction is appreciated! Thanks