The 302EFI in my '85 is still going strong, but I'm plotting against it... After reading a number of posts on the subject of swapping in a 351W over the past several months, and considering the necessities involved (changing front engine dress, etc.), I've just about decided to add a 347 stroker kit to a 302 block, along with a roller cam / lifters / rocker arm set-up, and Explorer GT40P heads. Considering that this would seem a bolt-in, and would make my investments in exhaust, engine accessory replacements and upgrades, etc. hold rather than be written off, I believe it will be more economical in the long run, with less headaches. Having said this, can anyone offer any input or thoughts on this mod? Specifically, I am concerned over what adverse affects, if any, the extra 45 cubes would have on the computer's reaction. I've read that some have kept the stock 302 EEC when they dropped in the 351W, and it ran with no problems. It would seem that this, then, should work okay with the 347, but I wouldn't want to cheat myself out of any power gains. I understand that the computer controls the mixture of fuel and air, but can anyone tell me if it has parameters that, at some point, limit volume? Or, is this controlled solely by the fuel injectors and regulator and throttle body? Should I consider upgrading the injectors? I basically want more torque and power out of the truck for daily driver and occasional towing use. It's going to stay EFI, and I want to keep the computer happy (good idle vacuum, etc.) I figure that the stroker kit and the milder upgrades I'm going to make (shorty headers, K&N, roller valvetrain, electric fan) will put me a bit over the stock output of the 351, while keeping all else the same. The prospect of the EEC "thinking" that I've still got a 302 to feed and run concerns me if it's going to interfere with the 347's potential, though I may worried for nothing as the '85 technology may not have been this refined. I'm only in the planning stages of this, and welcome any replies or feedback. Thanks in advance.