how much advance

[greenRT_SE]

I have a 440 magnum whit 10.5:1 piston.mopar 2725-272-.455 lift cam,Crane 1.6:1 rockers
original 906 head intake is Mopar M1 dual plane and carb is 750 cfm vaacum holley (cylinder pressure is 180psi) ignition is . MSD 6AL ,msd II coil and MSD vaacum distributor no.8387 (distributor is out of box)
how much I need initial and full advance .I think at the advance curve have to be slow, cause whit that much cylinder pressure and fuel (93 or 98) whit Mopar distributor i have a detonation whit part throttle. :(
car is whit manual 4-speed trans

[msdtech2]

The timing curve will have to be on trial and error basis, you will have to try different combinations to see where the engine will respond best. The springs will allow the rate of advance to come in and the bushings is to allow how much total timing you want. Every engine is different and will respond different.
Thanks,
msdtech2