413 in the 68 barracuda

Well, I'm not particularly up to date on what's available today, and I don't know how much you know, but understand that just because a piston is listed as a 10:1 piston doesn't mean that's what you'll end up with. (If you already know that, I apologize, but many do not.) The listing should give you a piston deck height, and then with that, your stroke, rod length and block height, you can calculate where the top of the piston will end up at TDC. A few years back, I did that calculation for supposed 10:1 413 pistons and I came up with they would be .080 below deck at TDC, which is where the pistons that are in my 413 are. (The motor was rebuilt before I got it.) That deck height, with .039 head gaskets and uncut 906 heads (or was it 516 heads?) ended up at about 8.5:1 as I remember. Steel shim gasket will get you up a bit, but nowhere near 10:1.