A 5.7 hemi for 3600 then complete swap for 5k? Someone is dreaming You'll have the 1400 in ecu and wiring alone. Then there's fuel pump, radiator, engine mounts, headers/manifolds that fit and so on. 5k would realistic with a used junkyard engine.

68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram