Looking for a specific cam and valve size recomendation on acheiving 20+ mpg's and 275 to 325 lb/ft of tourque from a stock fuel injected 5.0 roller engine (out of a '92, going into a '66) with performance flat top pistons. Id like to reuse the factory cast iron heads and have some port and polish work done to optomize flow.

Here ar the specs on the car: '66 coupe, 17" wheels with 245/50 tires, 3.73 gears in 8" diff, Shelby suspension in front, mid eye leafs, no power steering, a/c from the '92, stock fuel injection and computer. Am considering going to aftermarket or Cobra intake f it will help me hit my goal of power and efficency.

And a question. Im new to tuning fuel injection and i read that the EEC setup is actually fairly adaptive to changes as long as thare not massive like a wild cam or huge valves. So how accurate is this?  

Asking for 300 ft/lbs of torque is about like asking to have your car painted without saying what color you'd like.  Torque is tied to RPM.   If you want 300 ft/lbs at 3000 RPM, you'd be building to make about 170 HP at that RPM.  If you want it at 6000 RPM, then you'll be building and engine to generate over 340 HP.  The stock 92 system with lower gears (don't see a trans listed in your specs) should deliver the requirements with the right calibration.  Check with any of the major cam mfg for a recommendation in that area.  AFAIK, most mass air systems can deal with cams until you get down into the 108 and tighter lobe separation area.  Probably 110 or wider is better. Crane 444211 or 444221 would be in your zone.  You get real radical on the cam (which doesn't fit your parameters anyway) and you'll want to switch to an aftermarket speed density system.  Big valves may also require piston notching.  The best upgrade for an engine like yours is cylinder heads.  

Max torque in the 3000-4000 rpm range is where its at for me. Its for a street car that wont see speeds in excess of 85 mph usually. Car has a TCI AOD in it with a lock up converter. Have looked around and it looks like one of the cams you mentioned and port and polish job on a pair of reworked stock heads with aftermarket valves slightly larger than stock would fit my plans well. Port matching all surfaces on the heads and intake is planned too. Later I may step up to AFR 185 heads and a better flowing intake. May also try polishing the throttle body to 61mm first before going up to a 65mm aftermarket unit. Got a set of well breathing JBA shorty headers. Running a good set of cats so the computer and enviroment is happier. Stock ignition is going to be upgraded with an MSD box. These upgrades along with conservative gearing in the diff (3.25:1)looks like the way to go for the milage and power combo I want. Looks like a lite tune will have me going. Thanks for the reply. Its helping me get my setup together.  

Resto, I replied to your other post with the same question asked. Please see my response there about already having what you are asking for...

HTH...
Mark