I don't think there is enough physical room under the hood for a blower over the valve cover. You will need a 10" cowl. The 5.4L withough a blower is high enough.
Plus i think the heat generated by the blower would melt the composite intake. Typically there is an aftercooler under the blower and the intake is all metal for heat reasons. Those eatons make a ton of heat.
I don't think you are going to have the room for a roots blower on the top of that engine if it's going in a Mustang. I would think centrifigal blower
Sell the blower you have, build/buy a turbo kit. It's not that hard, just time consuming. Or pickup a centri blower for easy cheap power - but with that 5.4l I would get a bigger blower than an S-trim vortech, maybe a T trim or a novi 2000 or something. Or...take the motor down to shortblock and throw some rods/pistons at it and built it for spray...or better yet do some rods/pistons and a blower
thanks for the feedback fellas. i didn't mention it, but this is a BUDGET BUILD so any boost would be 5psi or less and the shortblock would remain intact. keep in mind that the car was 500 (2000 gt 5spd, wrecked0 and the 3v 5.4 was 600, and the blower/tb/inlet was 350. i'm in the military and don't have a lot of income to gloss over problems. like i said, i appreciate the input.
Well, i'm a mechanical engineer.....and i sorta think you have your work cut out for you shoehorning a 5.4L 3V into a 2000GT and then putting an M112 on top of it.
Not going to say it can't be done, but it's gonna take some serious thought and craftsmanship