You're on the right track for your 316 build calculations. Pistons with exactly 1.490" CH are going to be scarce. One advertised for a 408 with a 6" rod would work. Good luck.
What I would suggest here is to create a range of piston choices based on deck height and rod differences. This will greatly expand your piston options.
For example, stock deck height is nominally 8.206. Start working your numbers from there. This number can be altered by decking shorter, or raising with thicker gaskets. So, reasonably a milled short deck of 8.190, and a deck height clearance of .010 could use 1.475 CH. Likewise, an 8.206 block and .060" gaskets (+.020") would give .035 quench with a 1.526 CH piston. So, your shopping range expanded.
You can expand it even farther if you used stock 5.09" rod length, or the most common 5.4" stroker rods. Just the stock rods increase your overlapping piston CH options to a range of 1.475" to ±1.591".
Finally, consider less expensive machining to also expand your choices. For example, you could use common Chev 350 pistons if you re-bushed your rods for .927 pins.
Or, turning .010 or 020 off the top of the pistons can make other options feasible (now 1.475 to 1.611 or more - hey that's a 289/302 piston!). Creative options like this are why some builders can make stuff happen when other can't. Do your thing and have fun!