Exhaust Manifolds

Hello everyone, I picked up a 360 and I’m thinking about running exhaust manifolds,don’t know if I’m ready to spend mucho dollars on a set of tti headers quite yet..I’ve been reading up on the better flowing Magnum and Jeep Gran Cherokee manifolds..My question is,just out of curiosity why can’t you run two of the same manifolds, why is it preferred to run one of each,my car is a 78 Aspen with automatic trans on the column..2nd question,do one of you members have a set of the better...

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