273 mix matched head

I picked up a 63 Valiant ex drag car parts car. I working ongetting ready for parting out. It has a 273, 70 A body 8.75. As I was taking it apart i saw it has a 315 driver side head casting and a 920 on the pass. I understand these head number don't work together due to the intake bolt angles. Guessing they could be machined to work together?
Not new to Mopars, but my first 273. Thanks for any info

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