will a 440 mag fit

I agree. A big-block A-body is an awesome package but you'll need to upgrade more than just the motor. Big-Blocks put about 100 lbs extra on the front wheels, so brakes and suspension will have to be improved.

You'll find good tech stuff and helpful folks at:
http://www.bigblockdart.com/techpages/techindex.shtml
http://www.bigblockdart.com/

Good luck! :headbang: