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What is the highest compression ratio you can run on a 1st gen 4e-fe/5e-fe engine without causing detonation or damage on normal pump gas?

How can you check your normal unleaded gas octane level?

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I am planning on making a hybrid engine from a 5e-fe dis bottom end and a 4e-fe head(1st gen 5e-fe very rare). I have found the difference in compression between the engines is the amount of crown on the pistons. roughly 2mm crown=9.8:1, 1.5mm=9.6:1 and 1mm=9.4:1 I want to use the normal head gasket(TRD difficult to import). I will be using the 4e-fe pistons as the crown is 3.5mm which i can then shave to get the desired compression.

If running the 4e-fe ecu which is mapped for 9.6:1 can i run this compression without any fuelling mods?

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