If you feel 30 X 50 is what you need, go bigger. At least 60 X 40 IMHO. I also feel 12 ft ceilings are on the conservative side. 16 ft would be safer.
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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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