Rim width and sticky tire questions for a stock 914 Options

[stephestrad]

Over the past few months I've dipped my toe in the autocross waters...and I love it! I ran to my mechanic and was buzzing with visions of anti-sway bars, adjustable shocks, turbo tie rods, etc. After calming me down a bit, he suggested I start with the following steps:

1) Learn to be a better driver.
2) Get some sticky tires.
3) Repeat step 1.

I'm humbly working on step 1. It feels like I'm virtually relearning to drive, but man, it's so much fun! My questions for the forum are directed at step 2.

I have a stock '74 2.0 (without flares).
- If I were to get a second set of dedicated race rims with slick/sticky tires, should I go wider than stock? If not, what would be a good type & size tire?
- If a wider rim is better, how wide can I go? And again here, what type & size tire would work?
- Are sticky race tires sized the same as street tires? I looked through the Hoosier website and was completely lost in the choices.

These will primarily be for autocross, though my mechanic has also suggested I look into some NASA track events.