If you want a box kit then this might work, https://www.magnaflow.com/products/1...s?aces=5883676 I used the 2.5" kit on my 65 with o/s ram air manifolds and head pipes fitment was good and I did it laying on my back in the garage with hand tools.
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65 LeMANS , SD performance 462ci Engine, Tremec TKX 5 speed with a 3.73 geared 8.5" 10 bolt
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