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AFAIK, Old Model SBH front sights are in one piece with it's ramp, and the only way to get a higher front sight is to either build the blade higher with weld & dress it square; or cut off the blade & mill a groove in the ramp parallel to the bore for a new/higher sight blade.
However - before you go changing sights, it might be worth reviewing how the specific cartridge loads, and/or holding methods, can effect the boolits POI.
With most .44 Mag handguns, factory 240gr loads will shoot to the sights, but light(er) loads will impact higher because the boolit stays in the barrel a bit longer due to the load's slower velocity, all the while the barrel's rising from recoil - so if you're shooting low-powered (comparatively) loads, I would suggest first tryng full-power loads.
As to holding methods - while it's proper procedure to allow the barrel to rotate upward to facilitate cocking for a follow-up shot, some folks hold the SA revolver a bit too loosely, allowing the bbl to over-rotate, throwing the POI higher than normal/zero.
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