I have come across a Gen 1 Doubler up for sale that has never been installed. I'm told both boxes were rebuilt by ORD. Its set-up for a T350. Just wondering if this would be a good buy for my '76 Shortbox (350/T350/203/D60/14FF/4.56) or if I should just save up and go for a Gen 2 later. Mainly I am concerned about fit and lenght. The asking price is somewhere under $1500.