Anybody using Langdon's 292 Marine Cam?

I'm thinking of using it in my panel truck.
Engine is a 292, mostly stock, 2 1/2" exhaust manifold.
Maybe a 390 Holley on a Offy intake.
Going in a 1961 C30 Chevy panel truck, 5.14 rear with a truck 4 speed and a Advance Adapters Overdrive unit.
I'm getting 60 mph @ 2400 rpm if I did the math right.

Thanks.

Pete

Pete
64 Chevelle
61 C30 Panel truck