Beautiful Western metal-bodied plane.

Some say the Sweetheart blades are superior to what Stanley
later produced; I only have one (a #102) so nothing to compare it to.
As for tuning:
1) flat sole; *very slightly* convex in length is ok too, but flat is best for this plane's typical apps.
2) make sure frog is firmly in place, with mouth set for small opening, 1mm/ .040" or less.
3) "chip-breaker" or sub-blade well fitted to main blade, with no visible gaps, and fitted to apply significant downward pressure to main blade. Sub-blade should fit very close to main blade edge.
4) main blade is thin, so should be sharpened with a honing guide for best results. Around 30 degree
bevel angle- how you get there is a matter of opinion. I like a single bevel, but mainly use Japanese
planes. Depending on what you're doing, the blade will be flat straight across (typically jointing)
on have a bit of camber (smoothing) or a lot of camber (cross-grain roughing.)
Depending on the particular stone, sharpen to 4000 grit minimum. Shapton 5000 is good for workaday
stuff; Takenoko 8000 better for fine work.
This and the other suggestions sure to come should get you started.
A good article on planes and the forces acting on them (nominally about block planes, but applicable to any)
-Souping Up the Block Plane, by Richard S. Newman (details methods of Robert Meadow), in
Fine Woodworking: On Planes and Chisels, ISBN 0918804280.
-And if you get tired of fiddling, just send that beauty to me!

Good luck- CW.