as ink said you have one or the other... with flat tops you would have no compression....
the norms car was an easy 700hp on a 472 and the landy clone was an easy 775hp... i say easy becasue we dont rev them over 6800, with a low 12.5:1 comp they are low maintenance as well...
[ame="http://www.youtube.com/watch?v=ZNSpC2Nu-gE&list=UU2UfycLWJQRo0DnRrnW3KxQ&index=4&feature=plcp"]SS And AFX Landy In The 9's.MOV - YouTube[/ame]
[ame="http://www.youtube.com/watch?v=bie5_lBrFQk&list=UU2UfycLWJQRo0DnRrnW3KxQ&index=8&feature=plcp"]SS And AFX Mr. Norms SS Hemi Dart #1 - YouTube[/ame]
[ame="http://www.youtube.com/watch?v=m4DMFWiFU7I&feature=related"]SS And AFX Mr. Norms SS Hemi Dart #2 - YouTube[/ame]