swap motors, but you've got to re design the motor mounts, new fuel tank and lines, i think some re-wiring will have to happen, new exhaust, and a bracket for the water seporator.
OR you could just look for a luv with a diesel already in it. like i did, i've got a 1.8l gas, and a 2.2l diesel
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-Old ride-82 Luv diesel 5spd with some upgrades
-Past rides-82 Sierra, 78 Coupe De'Ville, 91 2dr Blazer, 86 RX7, 86 Porsche 944T (rear-ended and totaled)
-Curr. rides- 1970 Ford LTD 4dr, 390 4Bbl, 2nd owner! With a few Extras

00' Civic beater...