Welcome to here.
A factory 442 four door is pretty rare, heard rumors of early cop option ones but not in '72.
I don't think the four door is anything special?
May be special in the people's eyes that appreciate fine automobiles but not generally.
You never see many four doors or wagons on the web for sale, may be rare but it's because nobody wanted them and didn't bother to save them.
Rarity doesn't mean value in this case, Vista Cruisers are cool and hard to find in good condition but still aren't worth much, cost a ton to restore right.
They're worth more than a Rambler or something like that, not that bad, and you can get all the mechanical parts easily. I think the four doors are cool but most people want two doors and that's where the money is.
I would guess in poor condition around 2-3 thousand, with no rust and everything there, better off buying the best because some parts are unobtainable in reproduction and near impossible to find otherwise. I would say around 7-8K in top condition, just ballparking from others I've seen for sale.