No way would I use spacer on the header - that's just a continuous source of leaks and warpage.
You're on the right track with making a new bracket.... and sometimes it's a combination of relocation AND modification -- small movements.... 1/8" and a 1/4" there.
I'd modify the header collector and - if you're building a "DOOM" Ridler winner -- then recoat - if it's a driver I'd paint with heat paint (since it's under the car where it won't show). When I say modify the collector --- I'm talking about a small "C" notch for clearance.
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