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Need some help with the ID of engine parts 444-544

Need some help with the ID of engine parts.

This is a B20 block, Part number 496912; Serial number 32478; and down in front of the distributor we have the raised lettering " 1-419303"

The head has a large raised number 3 on the distributor side.

Crank is stamped on the front counter weight with an A and a E
The cam is stamped up front with "D2", near the middle: raised lettering "OBT 10", and near the rear raised lettering "Made in USA".

1) What is it that I have here?

I need to add manifolds and carbs, I plan on using a pair of remanufactured SU HS-6.
I live in Denver, so I will be driving this a 5,000-ft with trips though the mountains up to 10,000-ft.

2) Any suggestions on how to match the jetting of the SU carbs with the cam, head and driviing altitude ??






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