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I can help you with the engine block id. I have a chart that I copied from an old volvo parts book when I worked at a Volvo dealership.
Engine no: 496912 is a b20b with 118 sae bhp. It would have originaly been in a p1800 with a manual transmission. By logical deduction the year would have to be 1969. Sorry can't help with the head unless it is the original. The cam must have been replaced if it says "made in usa".
I used to have a 62 PV544 with that same engine installed and I used the su's.
I believe I had KD needles in it and it ran great. Of course I was at sea level
aka Florida. Hope this helps.
Cheers, Jim.
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