I see two sides to the fuel injection question. On one had it is a complicated system that will be a real pain if if fails. On the other hand we have millions of cars running around with old fuel injections systems that just keep running. The most recent Kohler EFI system has much lower parts prices then in the past. For instance, a new ECU used to cost around $500, now they are $150. A new carb is $250.
I do not see a reason to go above 22/23hp unless a higher hp motor is less expensive.
I would be careful going to a larger PTO pulley. The deck system is designed to run in the range of 3000 to 3600 rpm's. Going to the larger pulley on the PTO will move this up to 4000 to 4800 rpm. (the normal size for the small pulley is 4.5 inches, the larger one is 6 inches). The bearings and blades were not designed for this. At the least I would make sure the bearings are in perfect shape and balance the blades like you life depends on it.
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