[curtis73]

Additives these days don't have lead. They have other ways of boosting the octane rating, but the actual tetraethyl lead is a thing of the past.

I would say your most important thing is keeping the valve seats happy, but keeping 11:1 is going to be tough. The only way to do it as-is would be to retard the timing, but then you're sabotaging the intended state of tune and you'll be down on power... so the 11:1 won't be doing any good.

You could run water/methanol injection. Its a bit of a pain since you have to keep a steady supply on hand and if you get stuck 20 miles from home with an empty methanol tank you're kinda up the creek.

The simple answer is no. The real answer is, with a light foot, methanol injection, octane boosters, and a little retard to the ignition you should be able to keep most of the benefits from the compression and still be able to drive it. Dropping compression isn't a bad thing. Going to newer (better) heads and dropping to 10:1 could actually gain you a nice chunk of power and you won't need all those other tactics.