The first 400 block stroker motor I put together was with a 440 stock stroke forge steel OEM crank with the mains cut down and stock OEM 440 rods with flat top Ross pistons with valve reliefs for pump gas with stock type blue printed 906 heads.
I tried to get the customer to allow me to have it offset stroked to 3.91 and use a set of BB Chevy type long H beam rods but he said no shruggy
My first pump gas stroker motor I made for myself had a 4.25 stroke crank with a set of 6.800 long BB Chevy type rods with another custom made set of Ross pistons with 22 CC dish for CA 91 octane pump swill, that motor ran fine, it flat exceeded my wildest dreams boogie grin

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)