Can i replace only one head?
i replace both heads then cracked one of them...

I still have one good new head, and a good but used head... the cracked head is also new and has new guts all but one broken intake valve in the the cracked cylinder port...

My thought is pressure test the newer good head for peace of mind and also one good used one from before then replace the intake valves in the old head and use all the new hardware from the cracked head to make 2 good heads with new valves and springs etc...

Any suggestions on if that plan is doable?
can i change just one head?