At least the Puma now has the engines it should have had in 1971
A bit difficult. From Wiki.
The Turbomeca Makila is a family of French turboshaft engines for helicopter use, first run in 1976 and flown in 1977
In service with the 332 Super Puma in 1980.
I saw the first 'Super Puma' with Makilas in 1977. It was one of the original six prototype 330s with the flat Huey type nose. There was a one metre plug at the rear of the fuselage and single main wheels. The instrumentation inside hadn't changed a lot since 1966.