454BB valve cover hitting firewall!

[petey-pablo]

Any Input? I just bought a 1972 C-10 Cheyenne short bed with a 454bb TH400 it originaly had a inline 6 shifter on the tree and I was looking at the Motor it is sitting on the on V6 motor mounts wow I didn't know this could be done. Truck runs great but I tore it apart for paint But I want to change out the motor mounts . I was looking at the Driver side valve cover and it is hitting the fire wall Will this be corrected when I change out the motor mounts or do I have to pound my firewall in to make it fit right. Any one ever come accross this problem please much help is needed. I would post pictures but I do not know how...