I am runnin an Weiand Tunnel ram with 2 750 dps holleys atop a mild 429 bbf it works really good, always starts & never stumbles, Always uses a lot of fuel!!!! My Chevy friend was runnin a Weiand tunnel on his 427 with 2 780 vac sec Holleys, his was also in a Jet. His ran really good also.. Oh ya both motors where around 11:1 compression..