Add Wish List Quick view Choose Options 1947-59 Chevy 3100 GMC 100 LS Swap Kit Engine & Transmission Crossmembers with Mounts 47-59 Chevy/GMC Truck LS Swap Kit with Tubular Engine Mount. This kit allows you to drop in a modern LS or SBC motor into your classic 3100 pickup! Included is an engine cross member that mount to frame rails allowing you to fine tune... MSRP: $300.00 Choose Options Compare