Rent or borrow a pickup or van. Driving hoodless is just going to call attention to yourself from ricers and the fuzz. Also you can spend time aligning instead of doing a quick job only to have it open on you or get stick closed because of improper alignment.
Back when I was on the F-body.org mailing lists, whenever someone did engine work (or an engine swap) on their Camaro/Firebird, it was a ritual to take a drive hoodless. I'd find a way to tie down the X-air, and send it!
I had a '71 Chevelle in HS with a pretty worn engine. I drove it with no hood a few times, and when I hit the gas hard, the PCV valves in the valve cover (no hose connected) would mist my windshield with motor oil.