I do not know of any tables or charts for crankshaft stress versus engine torque, it is a pretty complicated calculation typically done with high power 3-D stress analysis.
Regarding engine RPM, I do not believe you are hurting the engine, by using aluminum pistons instead of the original cast iron pistons, you have probably reduced the reciprocating weight by 25% and reduced the inertia load on the rods by 50%. This is very beneficial to rod and rod bearing life. You have offset this benefit some with a 10% increase in RPM, but you are still to the good.
There a few Massey 44 in the pulling word that are bored and stroked and run 30% over on RPM, with very few issues, if that makes you feel any feel any better.
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Today's Featured Article - Memories of an IH Super A When I was ? up to 10, I worked on my Papaw's farm in Greeneville, TN every summer. As I grew older (7), it was the thrill of my day to ride or drive on the tractor. My Papaw had a 1954 IH Super A that he bought to replace a Cub. My Papaw raised "baccer" (tobacco) and corn with the Super A, but the fondest memory was of the sawmill. He owned a small sawmill for sawing "baccer" sticks. The Super A was the powerplant. When I was old enough (7 or 8), I would get up early and be dressed to
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