Not sure if they would fit in the frame, but more importantly, those headers aren't the best for an LS7. The LS7 has a different port shape and those headers are 1 3/4". If there's anything about the LS7 that isn't up to par with the rest of the motor, it's exhaust flow. It really needs 1 7/8" primary or a 1 3/4 to 1 7/8 stepped header... and even more so if you do a cam swap.
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