[BS12756]

Thats why you never weld the mount in first, if any one from this point on wants NOT to run into this problem you should install the whole mount assy on the engine lower the engine on the frame attach your headers and side pipes aline it all then some how either by welding or clamping secure the mounts. Then pull the bolts and remove the engine. Then do the final weld or what ever means you are using to secure the mounts.