hello, i just bought an E-150 with a 351W engine, with the holley 4bbl carb, this is much more engine than i need, and would like to go down to the 2bbl carb, at the least, or maybe a smaller v8, or the 6 cylinder, what i really want is diesel, but is that possible?? mainly i'm i'm interested in getting better fuel economy, i'll not be carrying anything heavy, nor will i be towing, so i don't need all that engine. and if anyone here wants the 4bbl carb and intake that would be cool. anyone have any advice??