Post to Hardtop conversion

I recently purchased a 1968 Dart 2 door post. Honestly I like the look of the hardtop cars better but I got a smoking deal on this car. I am looking to find information on how to if it is even possible remove the post and make it into a hardtop car. I am pretty certain that the actual post itself can be unscrewed and taken right out it is just the rest of the information that I need like do I need to change the window to fill the gap left behind or what needs to be done. Anything helps


Thanks
Jeff