the acceleration/wheelies are gonna depend on your clutch and variator. you could probably make that setup power a wheelie, easily if you gave a lil tug.
top speed that setup, no porting and stock variator? probably high 40s
temp gauge? usually a good idea. that setups gonna get hot, hobbits gonna get hot. it's why people buy all sorts of water cooled heads or bigger fin variants. That said, many folks run kitted hobbits with a stock head and that setup should survive it, that kit's pretty robust. general rule of thumb says keept T<400 but I wouldnt be surprised if that got up to 420+ regularly and I've seen people run the iron malossi and DR up to 450 and still go forever.