Kirk,

Nice-looking plane!

My guess is that the infill that you got with the plane is a replacement. I
think that the proper repair would be to make a new infill, making sure that it
supports the blade properly. But before I did that, I think I would try to shim
up the existing infill from underneath.

Good luck!

Chuck Taylor
north of Seattle

--------------
I few months back, at our July FleaBAG run, I pickup up a small bullnosed 
infill plane, probably Bronze.

https://kirkhmb.smugmug.com/Woodworking/Tools/Bullnose-Infill-Plane/

....the ramp behind the mouth is not coplanar with the back end of the body that
the blade is held down against. About ~1/8" too low)