Nice car!...IMO 17 inch is just about right for the wheels...no idea if cragar make a 19 inch wheel, but they look pretty similar to Torq thrust II's so you might need to go that route if you really wanted 19 on the back! Back spacing is the big issue with larger wheels...to clear suspension/leaf springs and not bottom out every time you hit a pothole (lots of those around these days!).
I can recommend Burnham Autos (ask for Paul) if you want suspension mods or any good quality work done to sort out your car...
Builds rods to a high standard and is a 100% guy if you are in the South East. I'd trust him with any job on my Camaro for sure (and I'm not related in any way I'd like to add!!!).
As an aside I'm interested to know why the low profile/big wheel thing has taken off so much. Look at the fastest cars in the world- Formula 1 and the top drag cars...they have big fat tyres not thin low profiles! Are they wrong and the pro-touring boys right, or is this about looks rather than performance? Discuss... (ha ha)!