Big Block Build is what I'm calling mine. New pics inside

[1963c-10]

Originally Posted by Chevy Fleetside

I got the Headers Thursday and tried fitting them tonight. Seems for me to get the left one in I will have to take the plugs out and I have to cut the frame a little for more clearance on the right side as you can see in this picture. They will bolt up but 1/16 of an inch clearance from the frame is not enough. I still have to patch the firewall on the left side also...

Did you trim the frame front the motor mount back to the cab for clearance? Im at the point where I'm ready to do the frame mods and it'd be nice to know where to trim prior to engine/frame mock up. Thanks in advance for any help. And I'm guessing about 1/4" - 3/8" to trim?