Will an IRFP 50 do the work for this schematic?

i recently made a some hv experiences. i made a 555 based ic timer along with and irfp 450 and worked great. but now i want more juice. i found this schema on the net and i was wondering if irfp 50 will work. i found those irfp in an old matsushita photocopier ( great stuffs inside)...
those mosfet are quite expensive that is why i am just wandering if they could do the work.

Picture of Will an IRFP 50 do the work for this schematic?
Well, the circuit you posted is pretty clear about what you need to look at in the specification of a replacement transistor. What does the DATAsheet say ?