That engine produced 289 HP. 4 speed cars could get to 60 MPH in about 7.5 seconds and hit 90 MPH in the quater mile in just under 16 seconds. Basically the same performance as a 1964 GTO.
The 4 speed was offered on the Lark platform in '63. When I had my 63 I had all the parts to convert it to a 4 speed. The 4 speed hump was actually fiberglass.