Get a 454, don't look back. (same outward appearance as a 396) You'll engine the extra TQ it has. Never heard of those mufflers. Get everything swapped over and see how it sounds. If it doesn't fit the bill, try a set of Magnaflows.
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1972 SS 454 Chevelle LS5/M21/12 bolt 3.73 posi
1969 Malibu COPO L72/M20/12 bolt 3.31 posi
1968 Malibu LQ9/4L80E/12 bolt 3.73 posi
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