Yes it would be possible to do something like that. I think you will not have enough material there though. You will probably have to add to the top or the trunk to fill the gap created by pulling the top forward. As well you have to do some metal shaping to get everything lined up. You could look at doing a pie cut in the top's quarter panels as well as to help tilt the rear window down.
For those who do not know what a 48 Dodge 4 door rear looks like I have posted a pic below.
I know that there have been several threads on the HAMB that have dealt with difficult chops. Trying doing a search for four door chops.
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