Apart from the exhaust manifold and the driveshaft length, the L31 is as drop in as you can get....
Tim
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1972 Suburban C20
454/TH700R4, eaton-corporate 4.10 (looking for 3.7)
Sold: 71 Cheyenne 20
Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005)
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