How much does it cost to LS swap a square body?

Parts we've sourced so far for the C10 / K10 "Squarebody" (2026 retail prices; not a complete total):

• Speedway Motors 91012808 Deluxe AN6 GM LS Swap Fuel Filter/Regulator, 58 PSI ($74.99)
• ICT Billet 5510-KIT003EM LS Swap Engine Mount Kit, 73-87 GM Truck ($260)
• Chevrolet Performance 19212593 LS Swap Muscle Car Oil Pan (LH8-style), LS1/LS3 ($312.79)
• Speedway Motors LS Swap Radiator Hose Adapter w/ Steam Port, 1.5–1.25 in ($42.99)
• Aeromotive 18688 Phantom In-Tank Fuel Pump System for EFI swaps ($665.60)
• Speedway Motors 91012808 Deluxe AN6 GM LS Swap Fuel Filter/Regulator, 58 PSI ($74.99)
• Speedway Motors 1999-2003 Vortec V8 Wiring Harness ($612.99)
• Speedway Motors LS Swap Conversion Low Profile Oil Pan, OEM filter location ($324.99)
• Speedway Motors LS1/LS2/LS6/5.3/6.0 to TH350/700R4/4L60 Adapter Flexplate ($247.99)
• Speedway Motors LS Crankshaft TH350/TH400/700R4 Torque Converter Adapter Sleeve ($30.99)
• Bills Hot Rod Co. 200 Series (Mid) LS Accessory Drive Kit (alternator, AC, water pump, PS, brackets) ($1,159.99) (optional)
• DeWitts 32-6239019A LSX Conversion Radiator, 1973-87 C10 ($1,796.99) (optional)
• FiTech 71014 Ultimate LS EFI 750HP system (intake, ECM, harness) ($2,314.79) (optional)
• FiTech C10 LS swap fuel tank with pump and sender ($600) (optional)
• Speedway Motors Gen 3 LS to TH350/700R4/Powerglide Transmission Adapter Kit ($313.99) (optional)
• Holley 20-190 Premium Mid-Mount LS7 Complete Accessory System ($3,799.95) (optional)
• Speedway Motors 1966-90 GM A-Body/B-Body/Truck Aluminum Radiator ($303.99) (optional)
• Holley 550-917 Terminator X Max Early Truck Engine MPFI Kit ($1,698.95) (optional)
• Speedway Motors 2.5 in Dual Exhaust Mandrel Bend Kit ($166.99) (optional)
• Hooker 8502-HKR LS Swap Cast Iron Exhaust Manifold, 2.5 in ($466.95) (optional)
• Flowtech 11575FLT Shorty Headers, GM LS Universal ($311.95) (optional)

Required items listed above total about $2,648.32. On top of this you'll need the engine itself (junkyard or crate), wiring/ECU and tuning, fuel system, cooling and exhaust as applicable. See 'How much does an LS swap cost?' for typical ranges of each.