I would get the NGK equivalent of the Autolites , I've installed thousands of Autolite spark plugs since 1979 and my shop won't order/install them anymore because of quality issue's since the factory moved they are not the same , I've posted pictures on Wes's FB on some Autolite's where the center electrode was very off-center from the case and ground electrode , would literally have to bend the ground electrode sideways to be in align with the center electrode .Had customer cars (non FE)coming back with miss fires and be an Autolite plugs so we stopped using them
On a side note I just installed a new pickup in my MSD but when my pickups go bad they don't won't to spark under cranking conditions (Digital 6 trigger light won't flash when cranking) turn the key off and try again until it flashes to start but once started it seems to run fine at all rpm levels
