i was talking to a guy this past summer that was building a 46 plymouth coupe. he did a bunch of measurements and said he was going to use a 300 as a donor for front/rear suspension and the drivetrain. he said every dimention he checked was within 1/4-1/2" of the stock stuff. he had a rollover 300 he was getting and he said the drivetrain/suspension was perfect with only 56k on the clock. oh, it was a 5.7 too ! if i remember correctly, he paid $2100 for the 300.