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So is the 899 383 stamped HP or not?



No.



What is the 900 383 cid then ?



I've seen 900 used for a late built Charger automatic no air.



925 = 383 4bbl, 4-speed, heater (RM/WM)

926 = 383 4bbl, automatic, heater (RM/WM)

Is this correct?



Yes but you'll find 925 in non RRs and SBs (e.g. WP, RP, XP)

Seeking:

1969 St. Louis plant VINs, SPD, and VONs.
Over 2,000 thanks to you!