There are tons of vintage Dattos in scale.
First, Doyusha made a 1200 Coupe, 1/24 scale plastic kit, released under their "Nostalgic Heroes" Series. The body has good detail, but the interior is crap and needs to be redone. Also their's no engine.
Hasegawa recently released a 1969 1600SSS Sedan (510). It is VERY nice, although being a Japanese kit, it still has no engine.
Revell re-released their old "BRE" 510 kit recently under the "Tuner Series" line. This time around it has no BRE decals, but does have a stock interior (the BRE kit had only a cage and one race bucket). As well, being a US kit, it has complete engine and suspension details.
Revell also recently re-released their 240Z kit. It is the only early Z kit available with an engine, which makes it recommended. Otherwise, it's not too great. With some work it can make a nice kit, though.
There are lots more where that came from, too. If you are in the US you can get the Revell kits at your local hobby shop, and the other stuff can be ordered from HobbyLink Japan for a good price.