360 build recommendations please...

I agree with the heads and gears. A tire about 26 - 27 inch will do. The cam, is good, someone will allways say theres is better, There alot like underwear.

Some older builds (Like the MP tips section) use stock heads with 2.02 to get the job done, but also use a bigger cam as well. I think that 12sec. tip section was a 292 purple cam. It's kind of ruff for the street. Doable, but ruff idle and will not wake up until 3000 rpm's.

A split duration cam is something you'll want with the set up you describe.
There are no template for that style/year head. I don't think you'll need to port the heads for a mid to low(ish) 12 second run. If you fall short, then I'd bet just a pocket porting and good valve work will do the trick.
Get that car to hook up well and most of the battle is done.