2.7 CIS to Carbs - how much HP loss? Options

[Scott S]

Hi All -
Got a line on a rebuilt 2.7 out of a 1977 911S. It is 100% complete including the full CIS system. What kind of power loss would I experience if I stripped off the CIS and went with carbs? The motor is only 165hp to begin with...

Thanks!
Scott S

[Mountain914]

Just want to throw this out there - since the title says how much HP loss.
It's my belief an engine will make the same power on any non forced-induction system providing it is tuned to take full advantage of the air/fuel mixture provided. I realize the path that the air/fuel take to enter, and the point(s) at which it enters also make a factor in detination within the cylinder.
So what are we really talking about here ?
Camshafts - provide the amount of intake (fuel and air) and how well the cylinder is evacuated (exhaust) - so a CIS engine has lower lift ? shorter duration ? (looking for comparison information).
CIS - mechanical fuel injection that is not direct-port that will take aproximately the same path to the cylinders except for within the assemply itself (right?)
Carb(s) - The main advantage to be had is the more direct path, thus "getting a good run at it" and the ability to easily change the air/fuel mixture ?
Fuel Pressure / Pumps - Carb(s) take less pressure to run, hence need a return mechanism to return the unused fuel. Wouldn't the supply be a bit more dependable on injected vehicles ?
Pistons (compression ratio) should be matched to the camshafts providing they don't hit the valves.
I had a 2.0 carb'd car (delorto) and now run a 3.0 CIS. A daily run will take me over 4000+ foot change in elevation at high altitude - From 5000 to 9000 feet does a carb display that much difference (mine didn't - it ran great)? Between the two I would take CIS because I don't get the fuel smell though it doesn't have the great looks you can get from carbs.
Sorry - I rambled - I swear it was my keyboard (IMG:style_emoticons/default/type.gif)
To summarize - are you all saying there is more horsepower from carbs only if the cams are changed or simply because of one of the above other factors ? (I.E. what is the total package?) I don't believe just changing the top end would increase horsepower unless you are saying the CIS is not providing enough fuel/air for the engine to begin with.