You can still get Indian Head at NAPA, if the guy behind the counter is old enough to know what it is.
Guys, I had to learn the hard way that boosting the CR by dropping the deck on big-bore pistons isn't a good way to go. You're better off to start with a high compression race piston and mill the top down to get to a streetable CR. I used that procedure on my first 700 cc. engine, knocking .030" off the crowns of a pair of 11:1 Venolias. The CR was still pretty stout, and after a few nervous episodes with octane boosters in places where high octane gas wasn't to be had, I decided to used a pair of 8.6:1 JE's from Shell and drop the deck by .030" to get to ~9.5:1. I'd done up to .040" on stock pistons with room to spare, it ought to work fine, right?
Wrong--there was hard interference at the squish the first time the crank was turned. Then there was the trip with the motor to FTZ Racing in Cape Girardeau, MO, where they cut the squish bands for a very low price--and left me with clearances that would have grenaded the motor. Then there was the trip to Charlie Southgate's shop in Nashville, TN, where the right motor cover was stolen, my wrapping was removed so that the motor got covered with grinder debris, and I took the motor back after 10 months with no work done. After stripping the motor to the cases and flushing Mr. Southgate's grit out of every part, I decided I'd jumped through too many hoops over a half point or so of compression, and reassembled with OEM deck height.
But it's all good. The 8.6:1 CR is enough to work well with Jack's port work and the Taiwanese camshaft, and performance is lively enough to be satisfying. When I get ambitious I'll have another .010" milled off the crowns of the Venolias and drop those on with fresh cylinders and the trusty old Shell #1 cam, but for now I'm satisfied.