I think you mean dual SU's, right? The carbs in good running condition, alone, might be worth the $200, buy the car.
The 510 L-16 is like a L-20b with a 3/4" shorter block (basically a 4-cyl. L-24). The z-car or p/u 5-speeds bolt right up, or a roadster or Naps-Z one w/ a L-series bellhousing. An L-20b would
probably be a better street engine.
There is even a FACTORY EFI AND TURBO manifold. The Z-car R-180 diff will go right in too, though not really needed. Subaru used the R-160 diff throughout the 80's and LSD's were on most of
the AWD's, good cheap swap. Engine swaps range from "frankenstein" LZ-22, Z-18et's, rotaries, VG-30 or 33's, sr20de(t)'s, to Buick 215 and Ford 302's.
The 69 510's came with different grilles and dashes (the rectangular, sweeping speedo and metal knobs for headlights and wiper controls), most people switch to the later (70 and on) dash with
round gauges that you can get a factory tach for. The sidemarker lights are different on the 69 (the 68 didn't have the rear red one's and the 70-on cars got rect. shaped ones) and I believe
those are NLA, NOS ones are out there but real expensive. The 68-69 model also had METAL side vents (very desirable) with no exposed screws, can't steal'em. The taillights (unique to 69) and
front turnsignals are also slighty smaller than the later years (different lenses) and the front valence and taillight panel are different to match. I think the 69 used the roadster fusebox.
The 69 crossmember has a higher pickup point for the control arms than the 70-on (the 68 is higher still?), good for a lowered car. The 69 control arms (hard to get bushing for 69 arms) are
different from the later ones and you'd what to switch to them so you can use the Energy Suspension bushings; B210, z-car and modified 200sx arms work.
What makes the 68's and 69's lower is their shorter struts, 10.5" to the spring perch for 68's and 11" for 69's, the 70-on cars got 11.5" struts. Doesn't really matter as you can take the
struts off, put them on your 1200 and use 200sx (11" like the 69's and you can even use z-car brakes) or 280zx struts with vented rotor (this seems to be the hip set-up, you get shorter struts
and big brakes). People are also making rear disc brake brackets for 200sx or 280zx rear discs. The 69 steering arms are also different, you'll need to find the older tie-rods (Moog makes
them) or reem them out to fit the newer tie-rods.
The little parts are what's expensive and hard to find; taillight gaskets, trim peices, fuse box covers, weatherstripping, 69 dashpad are NLA. But the good news is there's probably more
available from Nissan for the 510 than a 1200.
Look for rust in the *strut towers*, *bottom of front fender right between door and wheelwell*, FLOORBOARDS*, doors toward the bottom, inside wheelwells, trunk, by antenea on a-pillar, under
the cowl, and under the rear window.
If you get the car you should get on the Bluebirds (510) list, lots of good info:
http://www.dimequarterly.tierranet.com/maillist.html The premeire 510 site and newsletter:
http://www.dimequarterly.tierranet.com/ http://www.dimequarterly.tierranet.com/tech/spreadbury.guide.html More 510 tech:
http://home.att.net/~jason510/ http://kmhafer.homestead.com/datsun510.html http://www.bryanf.com/ http://www.ozdat.com/ozdatonline/index.htm http://www.pl510.com/