The XE letter code in 66 was for a 335 hp (carter afb 4 barrel) with an automatic transmission, the casting number located next to the distributor pad should be 9778789. The best way to verify everything about this car would be with the Pontiac Historic Services report.
The cost of this report is $50 and for an additional $15 they will fax a copy of the build sheet and billing history.
The letter prefixes on the Pontiac blocks have nothing to do with nickel content, etc. All Poncho blocks were made of the same material. Only the cranks, rods, and pistons differed in mfg. processes and alloys, and these are I'D'd by numbers and letters: N for nodular iron on a crank, or Armasteel for an armasteel (still iron) crank, etc. Some parts were forged while others were cast, etc.
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