I bought a '69 Pontiac LeMans (looked like a GTO, except for a nicer interior and a massive chrome bumper) back in 1979 when I was 21 years old. I paid $350 for it because the guy couldn't figure out what was wrong with it. It laid you back in the seat for the first 2 gears, but it would cut out at 50-55 mph, not to recover until it slowed down to 20. I thought it was fuel related, so I rebuilt the carb ... same. I changed the fuel filters and the fuel pump ... same. Then I disconnected the fuel line at the carburetor and the gas tank. I blew air into that end of the line with a compressor. Immediately, a projectile hit the ceiling of the garage. Ah Ha! Put it together, drove South from the garage on Tower Avenue for about a block and a half before launching off a raised railroad crossing for about 50 feet of air time! I found out, from the original owner that the motor was 396 with a Hurst shifter and transmission and an Eaton differential! The car eventually ran an 11.25 1/4 mile. $350 treasure!