No. I certainly wouldnt call that 'pro' street. It looks simply like a badass street car, hooking up hard on what appears to be 10" slicks? Thats sweet.
I agree with the term 'pro street' meaning a back-halfed and tubbed car with huge tires, usually M/T's fitting up into the tubs. Made popular in the 80's and 90's, now pretty much passť as real street cars are running 9's, 8's and even quicker on normal width slicks, without tubs or anything silly body butchery like that.
As far as the 4" cowl, personally I think they are so tall they get out of proportion and ends up looking goofy. However, if you have something under the hood to justify an actual need
for a 4" cowl that is awesome.
I would simply whack a hole in the stock hood if you're going with a tunnel ram or a blower. If you're gonna run something awesome like that, show it off! 67-69 flat hoods seem to be available on craigslist every day for cheap. Here's a perfect one for $50 obo http://seattle.craigslist.org/sno/pts/4614680995.html
As far as big block vs. small block, I went through this in my build plan too. I realized there is a ton of extra stuff you need to buy / modify to put a big block in your car. Since you have a small block car, just keep it a small block and build a brutal SBC. Just build a stout 383 or 400, and I think you'll be quite happy with it. With the 3.75" crank, you've got big block torque in a small block package. Besides, it is lighter, especially with aluminum heads and intake, and small block parts are always less expensive than BBC stuff.