OK, did not realize yours was EL. Best way to fit solid would be to cut flexes out and tack or full weld solid in place with the headers bolted to the block. Unlikely to get a good fit otherwise no matter how well you measure anything IMHO.
I'd still be tempted to do flex over sleeve though.
Might also contact APS and see if you can get a deal on an upgrade to V2 no flex bit.
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