I've not done a Marlin BA with sights but have done many others. I have had Williams ramps put on several rifles. I usually fit the sight
and have my smith silver solder them. I also have used the ramps with band and set screw. Back sights I have D&Ted in most cases.
The rears off post 64 Win 70s and Ruger 77s are my favorite. I really don't do a lot of rears. I put fronts on to use with reciever sights.