Finally got me a 521 after 4 years of looking! Has an l20b out of a 79? 620 don't remember haha! Got the truck from my buddy, traded one of my 4runner' for it. Story of the truck is a guy out in Omak had it in his field for a while no engine and stuff and there was a forest fire sweeping through so the guy turned on his sprinklers and watered the field and around his house a few days before the fire came. The fire burned down everything but his house the Datsun and his work truck, killed a lot of livestock and some barns but the 521 survived. My buddy saw it on craigslist and went and grabbed it after a 13ish hour round trip getting it! He put an l20b that I gave to my brother and my brother to sold him in it and used a parts truck for all the chrome pieces and things that got burned off! Has a 4 speed and does way to many rpms on the freeway so I need to put some lower gears and a five speed in. Now for oics cause who doesn't love them? Will get more as I work on it. So far I have replaced the fuel pump and fuel filter. GM 1 wire alternator and done some cleaning. got 21 mpg on the first tank! Think that sums up the first post!