Good evening... I've done plenty of work with my camaro, but I was hoping to hear from some of you more experienced guys about some non-obvious things to check for before taking a 4-hour road trip... I'm just trying to cover my bases... having only owned my 305 for a short while, I'm not sure of any "more common" problems that develop through long trips..
thanks for your time..

 

4 hours would be about 3 days of commuting back and forth to work.

As far as my car is concerned, if I didn't think I could shut the hood and just drive the car to work and back for 3 days running without something breaking, I'd be looking for a new hobby.

Seriously, check your fluids, fix any leaks, check your belts and hoses carefully, make sure your tires are aired up properly. I'd suggest 35 front and 33 rear WHEN ABSOLUTELY STONE COLD, meaning, if you walk out to the car tomorrow morning, BEFORE you even back it down the driveway, measure them, and add the difference between those numbers and whatever they measured COLD, when you get to the gas station (like, if one was 4 psi low, add 4 psi, NO MATTER what it is when you next measure it).

Put a couple of bottles of water in the back seat, some good tunes, pair of sunglasses, comfortable shoes, clean all the glass AS SPOTLESS AND STREAK-FREE as you can get it. Rain-X the glass if you think it might rain.

 

Now THAT'S solid advice! Funny, that covers my most common problems
I'd add;
bring along a flat blade screwdriver, 9/16" wrench, and a tire iron and spare (if you don't normally). The screwdriver will help you put back on your upper rad hose if it slips off (mine does!), and the water will refill ya.
The 9/16" is mostly for good measure, heck, most of everything under the hood is that size...