Will someone please point out which bit recreates a 2.7RS apart from the ducktail? And how do you get 343bhp from 3 litres?

1967 Porsche 911 Historic vehicle, RS Recreation
DescriptionThis is a 1967 Porsche 911 Historic vehicle, RS Recreation, it has under gone a ground up restoration and total rebuild approximately 7 years ago. It was built for a show car ,an ultimate track day car / road car. This car is an RS recreation done with total enthusiasm love and care.
This is an original Porsche and has been built to replicate the ultimate 1973 Porsche RS by a local Porsche specialist.
Specification is as follows:
Finished in Maritime Blue with Carrera Decals and the classic 2.7 light weight duck tail spoiler and sported light weight 964RS body work
Bilstein Suspension all round
Strut brace on the front
Turbo Brakes drilled
Sports exhaust system, braided hoses
17" RS Spilt rims
Its running a 3.0 classic air cooled engine on 906 cams, Weber carburetors, JE pistons and uprated hardware allowing a full 343hp at 8000rpm
The car has FIA light weight racing seats, FIA racing harnesses, fire extinguisher, Roll cage, detachable Sparco racing steering wheel, RS style door cards with pull strapes and window winders which are drilled, aluminium drilled peddles, white dials.
The car has only covered 1,600 miles since its been built

