Which A-bodies do big blocks fit best in?

NONE. They're all a *****.
Take ya at least a day to remove the engine, but a small block comes right out. Headers are a nitemare, no matter what brand. You will be heating and pinging them to fit for days.

Take it from a guy who has raced a 440 Dart for years...Getcha a hot small block.
You'll be one very happy Camper.

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???? a day to get the motor out? really? i could get a big block out just as fast as a small block. maybe faster because the bell housing bolts sre so much easier to get to on tbe big block. i used pro parts headers on my demon and didn't have to put any dings in them at all. the 64 valiant i had custom headers made and they were easy as hell to get on and off.