Only two 455s were available on Catalinas in 1971. Both had D-port heads. The two-barrel carbed 455 was rated at 280 gross hp (190 bet hp). The four-barrel 455 was rated at 325 gross hp (230 net hp). I beleive the net hp rating was with single exhaust. I don't have the torque numbers.
The round port HOs were available in two-door intermediates (T-37, LeMans, LeMans Sport and GTO) and Firebirds (Formula and T/A std) only.
1971 VINs did not denote engine anywhere. That started in 1972 for all GM cars. This car's VIN breaksdown as:
2=Pontiac
52= Catalina series
69=4 door sedan
1=1971
P= Pontiac assembly plant
The last six digits are the series numbers.
I hope this helps in some way.
Dan
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