24v Block with 12 Head?

I was in process of building a p pump 24v, then after I got block hot tanked, machined, and bought new pistons then i started looking into the head. I had it magna fluxed and found out it was cracked in multiple places and don't really wanna take the chance. Is it possible to put 12v head on top and just run it, or do I have to change anything else? I heard it was OK to do just wanna make sure before I dump the money on a head. If anyone has any input it's appreciated. Thanks