Why are you removing the fender cooler? Unless you're doing a slant-nose conversion, I'd say keep it.
Some people have installed a front cooler without cutting the trunk, but you don't get much airflow thru the cooler, which is what you really need.
Plus I'm just a maniac when it comes to cutting and welding.
I'm getting ready to re-do my cooler setup; I just picked up my new C2 Turbo bumper yesterday; I'll probably get started this weekend.
Here's how I did it with an RSR bumper.
http://vintagebus.com/howto/bumper-cooler/