The power added by nitrous is tough to beat.
If you are going to run methanol it isn't too tough. It runs much cooler than gasoline, just twice as much. You gain about 22 percent over gasoline. You would have to just about double the area of the jets over gasoline. You would need about 6 degrees more advance for the different burn characteristics. Methanol has a high affinity for water. You have to be careful in storage to keep it sealed and off the concrete or it can go south in a hurry. Methanol and nitromethane attack metals and rubber so it's a good idea to run gasoline through the system when you are finished with the race.
The real gains are made with nitromethane. 122 percent more power than with gasoline. But you don't have to run big percentages. If it was me, I would start with 20% nitromethane and 80% methanol. Very manageable for your motor with significant gains over gasoline. Your current compression should handle that, with about 40 degrees total advance for the slow burn characteristics. At 20% you would be about 22% larger in jet area over 100% methanol.
Always push to the rich side. Like methanol, nitromethane has a strong tendency to pre-ignition, but unlike methanol it has a much lower knock rating, it will detonate. The plugs should be about 2 ranges colder than you run with gasoline.
If you up the percentage you need to back off the compression ratio. At 50% you should be running 12:1 compression ratio. Maybe 9:1 for 75%.
As I write this I tell myself not to write a book, but its hard. Running fuel can be as hard as nitrous, but mostly when you start tipping the can hard.
In either case, there is no substitute for running it on the dyno and test runs before the race.
