Re: 302 to 351W swap
I am starting this swap and here is what I know...You will need a 351w lower intake. The upper will work from a 302. You will need a 351w distributor. The alternator bracket will bolt to the head with no problems. The ac/power steering bracket will work also. If you look at that bracket it has 2 different holes, where it mounts to the front of the water pump. One hole for the 302, one for the 351w. The exhaust manifolds will work, but I strongly suggest a set of short tube headers. The 351w needs all of the breathing help that it can get. I was told that if you plan on staying with the speed density computer that you will need to get one from a 351 truck. If you have a mass-air computer, you can use it and not have to replace the computer. Mass air can handle and adjust for the bigger cubes. The oil pan will need to be changed.
The 351w is a much better enginge than the 302 for heavy duty applications. If you are building up a 351, something you might want to considered is a set of gt-40p heads. The flow much better than the stock E7 castings and have slightly smaller combustion chambers. They will bring a stock 351w compression ratio up to approx 9.4 to 1 versus the 8.8 to 1 with stock heads. These heads are generally good for about 20-30 horsepower and about the same in the torque deparment on a 302. On a windsor, they generally add about the same in horse but really help out in the low end where our heavy trucks need it. You can pick a brand new set up for around $450.