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In an ideal world guides should be pressed out rather than bashed, but…..! Use a good quality punch that is just a gnats under the outer diameter of the guide or even better find a man with a lathe to make you a stepped drift that locates on the id and nearly covers the od.
Before you even start, and assuming that the guides are not flush with the base of the ports, measure the protrusion of the guide into the valve chest or even make a block that just fits under them so as not to push the new guides to far.
Perhaps putting the new guides into the coldest part of the deep freeze would be more acceptable to her indoors than the smell of roasting cylinder block. Even better, do you know anyone with some dry ice or liquid nitrogen?