Obviously it is an incredibly strong box, perhaps overkill for what you have, and are the ratios suitable ?
But at least it will be peace of mind for the future. No matter what box you move to it will involve a lot of work, so that aspect is largely irrelevant
If you wanted to retain the 4 speed, no doubt there are boxes in the US that can be built to handle what you need. Best to speak to someone there though
http://www.aluminumv8.com/catalog/20...ogComplete.pdf
http://www.yellowbullet.com/forum/fo...play.php?f=119
http://www.v8forum.co.uk/forum/