I like and use Autolite racing plugs in my motors that use the 5/8 plug socket size with the 3/4 inch reach like the Victors need, on your deal on straight gasoline with no spray I would try their 3911, on spray the next step colder 3910 If you have piston to plug clearance issues try the 3932 or maybe the 3931
I race my S/P car on pump E85 with 15.0 to 1 compression and it likes the retracted gap Autolite 3934. E85 is weird, it does not like cold plugs