Tire Hitting Heater Box
 

I tried the search function and did not find anything that had to do with my issue.

I have a 72 C10. I recently cupped my lower control arms and out tubular uppers on. The tire now hits the heater box when aired out.

Has anyone modified the heater box so that it still works? Or is my only option to lose the heater box and just shave the firewall?