What you need is right here on the SDC Website, from the Main Page, to Resources, Tech Tips, to V8 Engine identification.
http://www.studebakerdriversclub.com/V8EngineID.asp
The 259 Engines do not have 10.25 to 1 High Compression Avanti 289 Flat Top Pistons, but they do have 259 Flat Top Pistons, a whole different animal. Your 537555 Heads are good heads with 8.5 Comp.
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