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You are correct on the casting numbers for your car. I am confused on the build date for a 70 model year . The build dates for that year should be somewhere between May of 69 and April of 70. There is some overruns of late cars, but I have never seen it go into September. Those two casting numbers were used on all big block B and E body cars for 70 and 71 and a few C body cars. Some 72 cars used one side. With that being said, I have a set with casting dates of 2-22-1 and 2-19-71. Singles 2951865 with 5-22-69 and one with 8-5-70.It looks like you have some knowledge in these manifolds. I need a pair for a 70 cuda 440. I believe
2899879. Rh exh manifold
2951865 Lh exh manifold
Please correct me if I am wrong. My car build date is 9-3-70. Do you have anything? Thank you