If you have to replace the frame rails anyways......an Art Morrions rear clip would fit nicely in there. It comes with rails
http://www.artmorrison.com/rearclip-tri4bar.php
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Mike
Pro Touring 68 Acadian(Nova)
Speedtech subframe with high clearance control arms
Prodigy Bar rear suspension
Ridetech single adjustable coilovers
Wilwood 12.2" brakes
New Gen Splitters
LS3 and TKO600
Link to my build:
https://lateral-g.net/forums/showthread.php4?t=14349