I am replacing the exhaust manifolds on my 331 and purchased a used set that I was assured would fit. Now, I do not doubt I could MAKE these fit with some fancy pipework, but they are not the originals I had anticipated. I trolled to the best of my ability with the following casting numbers which are on both sides: 1674661. Can anyone help/direct me to what the REAL application for these are?1674 661 is the '57 and '58 Chrysler and Imperial left (driver) side exhaust manifold. This will only fit the 392 hemi.