Sure there might be 20-35 hp on the table going from a log cast iron mani to an absolutely expertly designed and constructed equal length tube style... but there are a lot easier, more reliable, and cheaper ways to pick up 35 hp for almost everyone on this forum.
Antihero
Putting AMS garbage, and $500 ebay wheels on a Z is like dressing a Victorias Secret model in a Walmart dress and Payless shoes. You're embarrassing yourself.