I have Hooker 2 inch Super Comps on my 496 72 Cuda. One tube on each side is a slip fit.
Had to make 2 small dents, but having a mini starter and eliminating power steering helped.
But no leaks in 12 years. Also had them ceramic coated inside and out. Putting them in
by myself in the garage was a hassle, however. I bought longer header bots from ARP, with
the small 3/8 drive heads, to get a better bolt "bite" into the water jackets. Never had any burned plug wires.
I highly recommend the plumbers white sealant for pipe threads to keep the header bolts from leaking.