My 9:1 493 with an MP509 248@.050 drove around fine with a stock hi stall converter and 2.76 gears but I got tired of the way the 1100 RPM idle pounded the driveline when you put it in gear. I put in an off the shelf 2800 TA converter from Mancini and it took all the bang out of it but it's still tight enough that it will drive away at idle on level ground. This was in a 4800lb Cbody.

Kevin