At around 3900lbs, 99mph to 104mph shows about a 55hp gain.

I guess I’ll have to add it to my long list of things I’d like to try on the dyno someday.

We rebuilt a 440-6 to basically stock specs last year.
2355 pistons, rebuilt 906’s(zero porting), felpro head gaskets, heads just milled the minimum, but it got a Howard’s 720141-12 cam(279/289, 225/235-112, .490/.488), and it was dynoed with 1-7/8” headers but without the air filter assy.
Made 410hp.

Mopar Muscle did an article on one about 2 years ago, pretty similar build, used a Comp 270h cam, made basically the same power.