Georeference cartesian co-ordinates to standard co-ordinate system

We have set of old maps which do not follow any standard co-ordinate system and they are just cartesian grid co-ordinates (for example lat,long 40.733828,-73.988414 corresponds to cartesian co-ordinates 1610350, 1114450) . I want to explore a possibility of applying simple transformation and geo-reference it to standard co-ordinate system. I can have little compromise on positional accuracy. What is best available method to do it oracle spatial?
Thanks

Well...
One approach would be via EPSG method 9621. Unfortunately, 9621 is not yet implemented, at this point.
Another approach is via NADCON, although NADCON was not semantically meant to be used in this way. If you can determine (lat, lon) and (x,y) exactly along the 4 corners of your unknown map, we could use the NADCON method. It is difficult to say how much accuracy you would get with these 4 points. The accuracy would increase with an equi-spaced grid of n x m known points.
Yet another approach would be that we simply assume a transverse mercator projection. Since your map only covers Manhattan - who will see the difference between transverse mercator or anything else (assuming that the projection center is near Manhattan)? But it is a little more complex, of course. First, we would need to perform a datum transformation with the required rotation. This would simulate the rotation of the map you talked about. Then we would perform a transverse mercator projection with its center near Manhattan. We would have to assume that your unknown projection also had its center near Manhattan (resulting in minimal distortion, there). This assumption is reasonable for a map of this scale.
If you give me approximately 5 points for which you know lat/lon and x/y, I will see what I can do. Usually, we do not do this, and it will certainly take a few days, for I will have to fit it into my schedule.
Also, a reasonable result will only come out if our assumptions regarding this unknown projection are mostly true.

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