I've decided to pull my Corvair transaxle to replace with a 6 speed Boxster S gearbox. From what I've learned this is a good option for the Manta Mirage. You want to get a 2000 - 2004 model year. The S is the only one to use. Do not use a standard gearbox. The Boxster S gearbox is a G86.20 6 speed and the standard is a G86.00 5 speed. There are multiple sources for an adapter plate and everything you need to bolt the transaxle up to a small block Chevy. One positive aspect is that this gearbox does not need flipped or the ring gear flipped as the Boxster is set up as a mid engine vehicle from the factory. I've attached some pictures for reference.
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