Vtr head and cam on furio,
 

Can it be done and also what kind of gains would I see??

can be done but is it worth it is the question, paying out over £600 you will defently see proformance gain 30bhp or less. its hit and miss with this kind of upgrade! cost alot on insurance. you would be just paying out silly money when you could just have a vtr!!

Furio is 75bhp
VTR (mk2) is 98bhp

How could moving the head and cam off a VTR give 30bhp extra?
The most you would get is 23bhp extra and that would need the head and bottom end transplanted

Not worth the bother in my opinion, if you want a VTR either swap the whole engine or sell the furio and buy one.
You will likely pay more in insurance as its technically a mod

for the effort it won't be worth it without a remap you wouldn't see more than 15bhp but thats combined with all the usual other stuff,

i said 30 or less... its a rough estimate!! proberly 20 or less!! depending on what else your running on the car!! extra cam adjustment via ecu remapping then proberly more bhp...