2002 Astro AWD engine swap

Hey guys! We've got an good 'ol Astro van that my mom loves but, it is getting older and not exactly fuel efficent.... So I was wondering what thoughts you guys had. I've been thinking taking an Isuzu NPR turbo Diesel and dropping in there, but they aren't readily available. So if you guys had any crazy/creative/cheap ideas i'd love to hear them


