As Art said, a lot depends upon whether the dovetails are of the US "standard" 3/8" nominal size. If they are (easily determined with a calipher) then the number of your possible options is pretty sizable. Some fitting on the sights' bases to match the included angle of the cuts may well be necessary, but that's easily accomplished.
Marbles, Williams and a number of others make replacement/upgrade open rear models and bead/blade front sights of many heights, widths and configurations. IIWY, I'd avail myself of the "tech questions" service phone number(s) at Brownell's, Williams, etc. for help and/or advice on what front height might be best. There are formulae out there for calculating the approximate figure, but most require having a measured sight radius figure and the amount of deviation from POA at a known range to plug-in, which would be difficult for you to determine since your rifle has had its original sights removed. It's entirely possible that these folks will have data at hand on what combos have been proven to work on the Winchester 62A. Worth a phone call to find out, IMHO.