No, a T3 will not bolt to the stock manifold. If you can't find a T3 manifold (I don't think I've ever seen one) you will need an adapter plate... It will probably be easier to get a T4 manifold and a T3 to T4 adapter, I don't know anyone who makes an adapter to mate a T3 to the stock manifold either.
Yes, a few people are running megasquirt on their MKIII. I'd hit SupraMania to research that one further.
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