New SHORT muscle car fan clutch!!

Mine is a 72 dart. It had a /6 now a 340 with a champion 3 core radiator. I have the new hayden clutch and it gives me a little over a 1/2 inch. I also have a motor mount swap kit not sure what brand. I hope that helps
Was wanting to know if a 6 blade 18" fan would pull enough air to cool for a future 400hp 360.