Just bought an MR2 today $4000 1990 black, mags, speaker system, done 140thousand no wing.. (did they come with one original?), its been sitting still for some time, and in that time oil has leaked into the right spark plug tube, pretty sure it needs new rocker cover gasket, BUT correct me if i'm wrong or need replace other things. Car didn't start but starter motor was ticking fine.. 
 
So i'm going to buy new plugs for it. My father swears by NGK plugs and the ones that fit are, NGK BKR6EP-8. <let me know what ya rekon.
also...i bought a replica Border kit. $600 for the lot and honestly its a shabby job all fiberglass, i purchased it before i bough the car, don't know how well its going to turn out.
 
Let me know what ya think, if its a good buy, what i should look for or replace to be as safe as possible when it gets its road worthy.

Sounds like a terrific bargain.
 
I think you've got the right idea when it comes to replacing the plugs. If oil's obviously been seeping through heavily into the cylinder itself you may need to clean it out. I'm not too informed when it comes to 3S motors however.
 
Can we see some pictures?
 
 

yeh, your right about the rocker gasket. the standard phillips head bolts they use to clamp the rocker cover down are somewhat budget, and the washers with rubber backings that go along with them often need replacing also.
 
go to deltaV's website and get their little rocker cover bolt kit so you can do that at the same time.
 
so it's turbo yeh? bkr6e is the std copper, up to you if yoyu want to go platinum, of just change copper plugs every 5000k's with service.

MRvirgan: I will get pictures when i visit the car next its still at the last owners house, trying to source a tandem trailer.
 
Just_ace: Nah its not a turbo, still on P's may look into a turbo kit when im cleared for opens. but have been hanging for a SW20 since i could drive so im going to cherish this one...
 
+ not sure i get your abbreviations. std copper? platinum???

BKR6E would be your copper alternative, cheaper but needs replacing more often. 
 
EDIT sorry I'm multitasking and missed your comment above just_ace...

Hmm...sounds like me when I bought my car lol. Was cheap as well, but even cheap comes with a price.
I would just go copper for the sake of cheapness and replace once a year. At 4k it's probably an early model SW20 so platinums/iridiums are wasted if it. As you already know it needs some work so be prepared to fork out if it doesn't pass RWC. To pass RWC just focus on getting the safety stuff sorted out - tyres, brakes, lights, visible oil leaks etc.
Give it a good major service - belts, water pump, gaskets, fluids. If you do it once the first time, there should be plenty years of trouble free service :)
I'd consider selling the border kit if short on cash. Function come first!

If it's na it won't be 0.8 gap, I'll check, it's prob more like bkr6e- 11

Well my old 2nd gen 3SGE was BKR6EP-8, as listed on the engine lid cover.
But the Beams 3SGE is 1.1mm. 

Yeh, just had a look then. Your right. Bit different, the gen 1 is 1.1 also, but gen 2/3 0.8mm.

Never had a gen2/3 na long enough to buy plugs for it.

From the service manual for Gen2 3SGE and 3SGTE