Engine Swap - Easy Big Block Swap
If your '68-'72 GM A-body originally came with a 350 small-block, you can retain the original engine frame mounts. If it had a 307 V-8, you'll need to switch to 350/396/454-style engine frame mounts (GM PN 3980711 left, 3980712 right), which should also work on non-Chevy A-bodies. On the engine side you'll need to upgrade to new GM big-block engine motor mounts (PN 03962748). View Related Article
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