Max Torque Big Block

Theres a difference between max torque and low speed torque (off idle powerband).

Torque on a NA engine is mainly a product of cubic inch.
Race engines can produce more than 1.4 lbs-ft per cid but a low rpm idle-4500 is gonna be 1.1 to 1.15 lbs-ft per cid. So if you want more than 500 lbs-ft in MH powerband of idle to 4500 you need to stroke it.

For parts selection you want cam intake etc.. the works off idle basically stock or a mild upgrade.