Should I buy? D16A8 EG buring oil

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Hey guys,

I found this 1991 EG si hatch (yes 1991) with the D16A8, It has enkei wheels (with 4 new tyres), koni shocks, lowering springs and a bunch of spares and its a really good price.

Only issue is that the engine has 300,000km and burns a lot of oil (the guy says he adds 1/2 - 3/4 liters of oil every time he fuels up). So I assume it would need a rebuild so I have a few questions

1) I would plan on doing this my self, I don't have much money so what would I need to replace to fix these issues (I would try do labour myself). Would piston rings, gaskets and valve stem seals be enough, and where is a good place to get it? (I'm located in Syd) are ebay rebuild kits ok?

2) I found a B16A2 (250,000km he says it blows a bit of smoke, no wiring and ecu) for $300, it says it needs a rebuild how much would this whole swap cost (I would do labour).

3) Not sure if anyone knows anything about Air con but it turns on for 15 min then doesn't blow cold, he says he took it to get re-gassed and the guy said it might be a clogged receiver dryer unit. Anyone know a fix or anything

Thanks