I have a Hurst shifter as well and love mine, that's definitely a good mod to have. Unfortunately I'm not sure about rain with your hood so I can't really help you much there, sorry. I'm not sure if your hood would actually help with performance, it will probably assist with cooling the car, but won't show a difference in power, even with a CAI. It's mostly an aesthetic mod. I would start off with a tuner instead of a CAI it will make a larger difference in power and gain your gas mileage, but will be a little more expensive. The car looks good, I really like that hood. Also welcome to the forum.
It's all about the smiles per gallon