The primary problem you have, as alluded to by the first response, is that different bikes are sized in different ways, and even in 1980s bikes, just because a 60cm from one bike fits fine doesn't mean another 60cm bike will fit as well. Each bike you consider must be evaluated with respect to "is this bike comfortable for me" instead of "is the size of this bike the same as the size of that other bike that fits."

You say the seatpost is close to its max height line - how long is the seatpost overall? A lot of older bikes have crazily short seatposts and almost any replacement you buy will start around 300 mm (~12") long.

As for handlebar height, replacement stems are available if you only need to raise your bars a bit (3" of drop from seat ---> handlebars is not outrageous, but not what most people want), and there are lots of other options like quill-to-clamp-on adaptors, stem extenders, upright handlebars, etc.. You can raise your bars above the max line and sit on the bike (DO NOT RIDE IT) to see if an extra cm or two will get you comfortable. It is likely that it will make a big difference. Then talk to your LBS to see what your options are for a new stem or adapter or whatever.

Remember - you only have three points of contact with your bike - saddle, bars pedals - and the shape of the triangle made by these three points determines how a bike will fit. And the triangle is adjustable with some effort.