340 Build

PRH said
Stock stroke 340 with a 4 speed and 3.73’s?

His information was scattered. Below are s what you missed.

disco said
Its a 340 bored 40 over....
———————————————————————
its in a 66 Valiant with a
(here I assume he means cubic inch displacement)
433 4 speed and 373 gear with 28" tire.

The OP gave most of the required information but not the complete picture.

Cam duration @ .050 and crank stroke along with static ratio (exact) are missing. Exact model & description of piston would help a bit.