I have just started my 351W project for my 91 coupe/AOD. From the information I have gathered, the expense is about the same when it comes to building a 347 vs 351W. Yes you do have to change headers etc but in the long run you will have a stronger, faster car if you do your project in stages. I am going to run some Rousch 200 heads because everybody thinks they are windsor Sr heads with more work. You got to look out into the future and decide what your goals are going to be for your project.
