Wow! Mechanical flat tappet, and then on top of that 11.5 to one compression?? Where do you plan to find fuel for your occasional use? I'm at 10.3 to one with aluminum heads, and I wish I'd gone closer to 9 to one so I didn't have to worry with finding gas stations with 91 or better octane gas, and then worrying how long it's been sitting in their tanks....