It's for early Firepower Chrysler. Bolts go 1-2-2-2-1 with the center 2 and the outer ones closer to the centerline of the intake.

The Desoto has them pretty much all in a row.

The Red Ram is backwards from the Firepower and the center two are farther away from the intake centerline.

It doesn't look factory to me, but the part number is, except for the "E". Is it cast iron or aluminum? I like the pencil calculations visible on the top machined surface.

It also looks pretty low-perf to me.

R.