I've run the Summit/Jegs 2.5" & 3" systems. They all needed some adjustment, but fit well overall. Supposedly Pypes fits really well, no personal experience though.
I would go with a 2.5" system, 2.25" is just too small for a big block IMHO.
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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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