Is 426ci 360 a small block?

Well the owner has some supercharged Corvette he would like to beat. The car is back for some transmission work, a switch from 3.23 gears to 3.91, subframe connectors and power steering box change. We'll go through the engine and swap the out the ported ProComp/Streetmaster aluminum heads for our ported LAX iron heads we have laying around on the shelf. At least that is the present plan.