Hi George,
I have answered this question hundreds of times, maybe it should be posted as a "stickie".
AE-6 Autolite=
Champion L90C
NGK B4H [4110]
Autolite 425
AC Delco 46F
As a youth we most often used an AC 45F [chevy V8] as it was very common and easy to aquire.
I normally use the Autolite 425 in all my vintage 300 and up motors.
Have fun,