I grabbed the derbi head. So far my head temps have been in the low 300s. I have not tried the puch head to know how it compares.
The derbi one had an issue clearing the petcock that was installed on my tank. I think it is not an OG petcock and hangs lower. Just had to trim out part of a fun to make it fit.
Also the Dr kit with the derbi head required some cylinder studs over the dumb stock bolts. I grabbed the malossi puch studs that were like 102mm. They are a touch shorter than they need to be so anything between 102mm and 115mm will be perfecto. Anything longer and I would be afraid that the threading would end before you could tighten it all up.