NV3500 behind a 340?

ny How, like I mentioned, My 71 Demon is Now running a 380 5.9 Crate Motor Magnum. I,m sure it,s pushing around 425 at least now! Torque is probably around 430lbs. below 6ooo r.p.m. I,m running 3:55 posi 8 3/4 It,s a driver . Mostly High Way!