Im looking at a 1980 datsun 510. Nice car but needs work, it only as 60k on the z20 motor. But the Z20 is old and needs to go, I dont know what to do, a KA24det or a Ca18det? I have alot of chevy motors too, maybe a chevy 350 or maybe a LS1?? Please someone help me

You'd be putting a lot of time effort and money into a car that's somewhat difficult to find some of the unique parts for and frankly wouldn't be worth that much when you're done. Which is basically the same scenario I face with my 79 810 2dr. That's why I just kept it stock and use it as a daily driver. Watching the classifieds, and eBay etc., I have noticed that the obscure Datsuns like my 810 or the late 510 that you mention as well as others from that mid to late 70/early to mid 80s era just don't generate the interest like the Zs, the 510s, and the Roadsters of the 60s and early 70s.

If you're going to swap....put a Nissan motor in it.

I'd go KA.

I can't say for sure...but it might be a lot easier to drop in due to the similarities shared by the two motors.

being that the car isnt as popular,id go all out. ca18 the thing and boost the h..l out of it.then figure out how to keep a rearend under it.but thats just me.i actully considered that in my 510 wagon.it be mean once you got traction.