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Well it better be much better for $7500 compared to the $3800 for the on3.
Not when you have to pay a shop to fix and repair the kit over and over again. I know three people that bought these kits. They took a lot of money to fix. And those owners who were very upset about the cost of repairing the kit, said the lack of customer support, refusal to ship parts that were missing and other customer service issues were what made the kit not worth buying. One had to buy $300 in parts. V band clamps, air cleaner and hardware were missing and they never made good on them.
Search theturboforums.com. They not only were pulled as a sponsor because of being shitty with customers on the site and poor products they were also banned from the site. This has happened on a few sites.
I know of the owner, chad. I do a lot of business with his dad. His dad is a awesome guy, makes quality parts and has a company based on customer service. Chad falls far from the family tree as far as business is concerned. I know the company chad hooked up with to build these kits. They were at sema with a copy of a well known 5.0 foxbody hot side. That is where it all began for On3.
They are working on a kit for your era vette. Feel free to buy one and tell us after one year his you feel about your experience. The only reason a company like this stays in business is because they know people who don't know better will be cheap. So have the cheapest kit and you will sell a ton. Until your reputation catches up with you in one market. Then you move to a new model.