I have a 56 that I have built a 496 stroker big block that will have a 540 Allison behind.
http://inlinethumb49.webshots.com/42864/2621987970096773078S600x600Q85.jpg
I believe that you should have plenty room for the swap the problem area will be steering box location and exhaust clearance which I solved by using a Scout II steering box and changing to cross over steering. http://inlinethumb20.webshots.com/43475/2952923250096773078S600x600Q85.jpg
http://inlinethumb59.webshots.com/44538/2116948240096773078S600x600Q85.jpg
I suspect that Grigg will stop by with some help here too as he has also used the Scout II box in his 48.
Take a good look though both our Webshots pages a picture is worth a thousand words you know.

Last edited by HevyHauler; 10/25/2009 8:49 PM.
The difference between men and boys is the price of their toys.
Grant from Roy, Washington
1956 6100 Chevy Dump Truck in the Gallery
1964 GMC Drump Truck in the Gallery
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http://s1301.photobucket.com/user/56Taskforce/slideshow/