Not too bad if it has been done properly.
10-years ago I bought a brand-new LR gen-parts re-power-kit inc fully-dressed 300TDi, R380, Disco transfer-box plus all parts needed for a factiory-fit installation (cross-member, exhaust, props, rad/intercooler, wiring harness, tunnel & floor etc etc) and that came in at £6K inc fitting.
Allow for inflation and that re-manufactured engine / gearbox / transfer-box looks reasonable value.