This is where we disagree, it's painting with a broad brush. The guys I mentioned are a good ten to fifteen years younger than me and were running imports before they could afford the "old school" muscle but made the switch as soon as they could. They have done it all the different ways including starting out with cheap ebay turbos. these guys know first hand what it takes to do both and will tell you although the basics remain the same what the engines want is different.