Do you have a system now ? I also would only run a wet system . Are you looking at a plate or a Fogger style ? I have seen 250 sprayed on 93 with a fogger and a MSD box pulling correct timing and a properly flowed fuel system .
I had a 355 with forged flattops and a NOS cheater plate kit and sprayed 82 square jets on 92 with the timing pulled manually 2 degrees per 50 hp .