How much room do I have to shim the drivers motor mount for headers

[BlackZR1]

Originally Posted by Jagdpanzer

Keep in mind it's possable to push the engine over to the right a few mm if necessary before tightening the mounts down.

Just another data point, a few months ago I noticed my low mile mostly stock car (no headers) probably came from the factory this way. Pic shows engine mount full right of the slot.