.. water-methanol injection ?? ..

just looking for some comments from some people experienced in this arena please ...

finishing up a street-build '66 cuda with a warmed over 318/904 combo ..
the engine dyno had it at a little under 300 HP with 310 ft/lb torque .. not that I will need it, but I was hoping for just a tad over 300 HP from the engine but fell a little short .. don't want to tear motor down again for additional head work or cam work at this point ... and don't want to add NOS because of the extra stress on the engine and the money involved wouldn't be worth it for my application ..
BUT, I read an article recently on a water-methanol injection system which is more friendly to the engine (and less costly) than NOS >> not the HP add that NOS gives, but it falls into the less ventured / so less gain category .. but it seems like a good compromise to get me into just a little more HP when I want it, with minimum more stress/complication on the motor side ..

does anybody out there currently run a water-methanol injection system now ?? .. planning on it ?? .. know anybody that does .. or have any experience/knowledge about them ?? ...

the system I was looking at is from Snow Performance ..

please advise .. thank you for your time