Help with decking or not?

.051 is at the top of the zone, but with aluminum heads, it will be fine. It might be finer with the .028s .. Aluminum heads like 11/1 Scr or better depending on the cam. Cylinder pressure can easily go to 185 or better. I run that with 87E10. I have successfully run Q at .034 since year2000.
My 360 at .034Q and 10.9Scr is now making a lil less pressure with the bigger cam (230/237/110) with a slightly later Ica of 64* . I seem to recall 178psi
At PT (Part Throttle), aluminum heads are sucking so much heat out of the chambers that IMO, they need a full point higher in compression just to break even with iron heads, in terms of efficiency. This leads to the pressure needing to be at least 10 to 15 psi higher than what can be used with iron. So if you had a tight-Q iron design that successfully runs pumpgas at 165 psi, a straight swap to aluminum heads will yield a net power loss at the same pressure. So you have to jump it up to to 175/180 to break even. This tight-Q and high pressure is a 1-2 kick in the rear for PT throttle response and efficiency. So you jump the Scr up to ~11/1 to equal the 10/1 iron headed combo in terms of effective Scr.
At WOT, the Al heads are still sucking the heat out, but the time factor is diminishing. So; IMO, the rising chamber temperature increases the Effective compression ratio and together with the rising efficiency of the bigger hi-overlap cam,now the effective cr is coming closer to the design Scr, and that is why the horsepower rises. In a good design the Effective Cr may exceed the design Scr, and then the VE goes greater than zero, and that is now making power.These are my opinions. In an sffort to keep the chamber-temp up, I run a minimum cooling system temp of 205*F. The car hit 93 in the Eighth on it's maiden voyage, so until someone tells me his 230-cammed,iron-headed 9.5 or 10.0 360-beast can do that all day long at 930 ft and 3467 pounds with 3.55s..... my opinion is likely gonna stay.
But I tell you what, when you hit the torque peak in third gear, and feel that power surge to shift-rpm for the first time, you will ask yourself; "what the heck just happened?" This ain't a VVT.
Iron-headed 9.5Scr SBMs don't usually do that with small 110LSA cams.
Enjoy