2.5 will be perfect. Either an X or H crossover will fit. Magnaflow sells a header back system with an X. The fit is very good, they offer it in 2.5" & 3". Pypes also makes a good fitting 2.5" or 3" system with an X crossover. Both good quality, the Pypes system runs a little cheaper.
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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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