Lock out the advance, and time to 32 deg to start with, read the plugs and advance from there. It MAY want as much as 38-40 deg, or not. Take that in SMALL steps! Note: just because the timing is locked out don't try to time it at idle! Take it to 3000 or so because the cam twists, timing chain stretches, and dist drive gear has slack too. I don't run Isky cams (lots of reasons) so post the .050 duration, lift, etc. You can get into a LOT of trouble with the AFBs if untouched, give us more info. TIMINATOR