Skinner peep on Mountie

Chickenhater, yes it will, provided your Marlin is already tapped on the side. There were some later years where the side of the receiver wasn't tapped, only the top.
So a top mounted sight is easy enough if you don't want to spend for, or have your receiver tapped for a Lyman or Williams.
Williams makes both side and top mount sights to cover the levergun market.

The OP specifically asked about front sights with the Skinner, I just assume that he knows about other types of peeps as well.
F-14 Chief, I have a .312" Marbles in the Mountie's ramp. That got me zeroed at 50 yards and the aperture post of the Skinner is maybe 1 1/2- 2 turns from the bottom.

I don't know why some are so set on a rear sight that allows you to keep the original front one.
If you need a higher front sight, just get a few, they aren't that expensive or hard to install.
Getting several in different heights increases your chances of getting the correct one on there.
It's no fun to order one front sight (and pay almost as much for shipping as you did for the sight), then find out you need a different one, then pay more shipping and wait for it to arrive.

Finding the correct front sight for this ported .44 mag was trickier, as I wanted to zero the Skinner peep at 75 yards, and also zero the ladder sight at a longer distance.
With the front sight I'm using, the ladder sight with slider all the way down is zeroed at 125 yards. So the ladder can be used where the Skinner leaves off, and there is plenty of room to move the slider up for long shots.

I mentioned the lyman/William's sights in case the OP wasnt aware of the options, or didnt realize the front sight could be retained. I also mentioned it because others interested in changing their sights may also read this and not have known as well.
Drilled and tapped or no, there are sights to fit the side mount as well as a tip off mount for the scope rail. The Williams GR will work with the factory front as well and clamps to the scope rail. Why not replace the front sight??? Well why would you if it isnt necessary. Its money you didnt have to spend and you avoid any issues that may arise from removing and replacing the sight. I know it's a pretty simple task, but sh#t happens. It's just like simple elective surgeries, sometimes things go wrong and the patient winds up worse off than before. So there's the reasoning.