Lets discuss another engine build

As for the KB362's, I just added up the numbers and the compression height is 9.558 which is about .041-.042" below stock LA deck height and about .02-.025 below stock Magnum deck height. The H116CP's are more like .055" below stock LA deck and about .035-.040 below stock Magnum deck. DO you have a Magnum block?

So either will need a lot of decking with an LA block if you want to get to zero deck and have a quench gap. The Magnum decking to zero deck would not be so bad with the KB's. Conventional wisdom is that you run a true 9.5:1 CR with iron heads IF you have a quench gap, otherwise keep it down closer to 9:1. With the 262 cam, I would stick with these rules.

I too am getting 9.8:1 SCR with the H116CP pistons with a .051" thick head gasket and assuming a Magnum block, but not zero decked. With the H116CP's at zero deck, I get 10.3 SCR with a .051 head gasket. Either is too high for your street use with pump gas and iron heads and no quench per conventional wisdom.

Going back to the KB's I get 9.25:1 with the KB362's at zero deck and a .039 head gasket (Felpro 1008) and a Magnum block. IIRC, the raised pad on the valve side of the KB pistons is at the top and will form a quench gap with the head's closed area, and so you will have the benefit of a quench gap to help the pump gas be OK with a 9.25 SCR. But check with KB on that raised part to be sure....) Those pistons are pretty much designed to meet your application. That is one thing I have noticed with KB: they seem to have more variety of pistons and look to have done their homework in dome designs to meet both the wilder high CR drag race apps and the pump gas street engines.

And as far as hypers... I have raced hypers a fair while with 14-15 psi boost with no problems; I was a bit worried but they were fine. And we just put some KB hypers into my son's 340 with the tops shaved .030"; the thinnest part of the head is donw to .185" miniumum thickness...so far so good but we yet to have really let 'er rip as we progress through a gradual break-in and wringing out fo small problems.

But with the lighter weight of the KB 362 hypers and pins, you will need to rebalance the engine, as you are dropping about 122 grams per piston and pin. It will make the stresses on the engine less. The H116CP weights are almost identical to stock so no rebalance is needed for those.