Will these exhaust manifolds fit my RR

I have a 1968 Roadrunner with a 440. I found a set of exhaust manifolds that they say are high performance. The right side is #2806900 and the left is #2843992. Please let me know if they will fit. Plus are they really High Performance manifolds. Plus what is a good price to pay for them.
Thanks

Those are the 1968-69 Hp manifolds for your car, they all fit though. The only true difference as far as mounting is concerned is the clocking of the outlets, but it really doesn't change anything.