t body and maf question

As big as you can afford. You cannot go to big on t-body or maf. Plus you do not have to worry about having to go bigger later if the car ends up being a real beast later.
 
At this point I agree with 5.0Torx. There's no point in upgrading the TB since the opening in the intake is somewhere around 60MM. You could put the MAM on but you won't really pick up any power from that alone.

Mods like these are best done from inside to out. Pick a block that you want to use be it the stock block (I used mine) or whatever. Then decide what you want to use the car for and find a suitable cam, heads and intake. This stuff should all be matched together. Then top that stuff off with the bolt-ons that go on the out outside of the engine like MAM, TB, injectors and the like. It'll come out a lot better and you'll be much happier this way.

I did mine on a budget and I spent years collecting parts before I put it all together. I'm very pleased with the results.

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With stock intake and heads, i wouldn't even bother. Slapping a 70mm or 75mm TB is a waste on a stock setup. Go with a matched combo. Aftermarket intake with a 65 or 70mm TB