.. water-methanol injection ?? ..

Inkjunkie is spot on. Water/methanol kits definitely help on a boosted or very high compression engine but really do nothing for naturally aspirated builds. What you may want to try is cooling your fuel. You can go the oldschool cool can setup or a co2 charge setup like dei offers. A cooler fuel charge temp is usually good for a tenth or two in track times so HP gain is real. First time i used moroso cool can on my 65 cuda when going to track regulatory ran a freak 8.12 in 1/8 mile as opposed to usual 8.5's. leveled off in 8.3 range.

Oldschoolcuda