What ype of 6X head, 4 or 8? Probably 8. You don't have to swap heads. XE cams are made to help with ow compression heads.You could shave down the ones you have to increase compresson. You need to confirm what pistions you have. Overbore will also increase cubes, compression. Do some homework and search combo/cam threads. There is alot of threads on this.
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68 Firebird
Are you running with the wind or breaking it?
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