Engine is in...need to shim driver's sideside

Woohoo! It's in!

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Hung the Doug's D453 headers to the side and dropped the engine in between. Worked out pretty good...
But not surprisingly, the driver's side is a little too tight...

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So how and where exactly do I shim that side?
Do the shims go against the K-Frame or...?

Victory beer in hand!

Jeff