I use a girdle in EVERY build I do period. I think they are worth every penny. I have one in my 340 with a crank scraper (up and down stroke) and could've stuffed a windage try in there if I wanted.
1970Duster, by chance do you have any photo's or detail on the scraper set up please, I have a Hughes girdle on my 408 and am a fan of windage trays so I'm just trying to figure out my best plan of attack before I zip it shut