I have a 1978 Cutlass Salon that originally had a 231 V6, replaced it with a 455 Olds/TH350. I am going to install ARH headers and dual exhaust. The trans crossmember will have to be modified or changed. My question: is the chevy SB crossmember the same as the Olds crossmember? Jegs crossmember is half the price of a G Force but is listed for a SBC. Has anyone used the Jegs crossmember with an Olds 455/TH350 combination?