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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