Awhile ago I got offered a couple Datsun 521 trucks one is a 1970 J13 with title, the other I don't know yet. One thing I found interesting is that all USDM 1970 521 trucks were supposed to have the L16 engine not the J13. It was mentioned that even though it is registered as a 1970 521 it is actually a 1969 521, I'll have to check the tags for build date when I go pick them up. in any case the plans are for an engine swap.
well this didn't go through