Looks like the plenum area is kinda big, I would craigslist em (lots of boat guys let em freeze and crack) and get some magnum manifolds and just reverse em if you want the turbo in front. Smaller volume and they flow really good. Like mentioned by jcc lots less iron to have to heat up also. I bet a turbo would be real soggy when cold and only slightly better when hot with those things on there.
I think this is the way to go. If I were to do it, that's what I'd do. Unless you can find some "shorty's" like this.
