Ken, the Henry Silver Eagle is drilled and tapped for a scope mount. You will need the Henry H004 Mount : https://henrypride.com/products/rifle-scope-mounts

Yes but with how the rounds eject itd probably work better to mount it forward of the ejector, you'd need to get it drilled and tapped to accept a rail forward if the ejection port (most reputable gunsmiths can do this for less then $60) and with mounting your optic forward of the Ejector you'd need to make sure that you were using an optic with a good eye relief, like a reddot, prism, or holographic sight.
But a traditional scope wouldn't likely work well set that far forward, there are a lot of PCC's and AKs that have forward mounted reddot and they work well.

Ken, yes sir, this rifle is drilled & tapped for a scope. Details here >>>>> henryusa.com/rifles/the-silver-eagle/