engine mods are easy. hardstuff is dealig with rust. unless you are well equipped. get a powerful flashlight and look up under the dash at the cowl vents.(circular openings). they rust then leak. when they leak water pools in the driver floorboard. driver floor look under car- rusty floorboards rusty cowls. rear trunk-window seal goes, window leaks. look under rear window inside trunk area, holey? rusty? look at lower rear quarters, follow the water trail. it's all about the benjamins and where you decide to jump in.