There aren't a whole lot of different thread configurations. Gasketed or tapered seat. 3/8" reach or 3/4". That gives you four combinations. Your bigblock Mopar head has tapered seats. The only plug that will work is a 3/8" reach tapered seat plug, it will use a 5/8" wrench.

A-C R43TS or 44 or 45 or 46
Autolite 25 or, I think, 26
Denso 5029
Champion 18 or 25
etc.
Uses the same plug as a 1970 454 chevy or '72 350.

Beyond that you are thinking too hard or worrying too much.

The attached picture shows the plug you need.

R.