Which is the power of engine and maximum speed Buick regal sedan automatic 1970?

The 1970 Buick Regal wasn't offered as a sedan. The Regal was a *two-door* sporty model introduced in 1973. The 1970 Buick lineup included sedans like the Skylark, Special, and Electra, but not a Regal.

Therefore, there's no engine power or top speed for a 1970 Buick Regal sedan because that car didn't exist. To get that information, you'd need to specify the 1970 Buick *sedan model* (Skylark, Special, Electra, etc.) and the engine option it had (various V6 and V8 options were available).