FeHi, im on my last nerve with my car,i just installed a 454 crate motor and had a shop do the break in ,all seemed good,then yesterday my wife wanted to go for a drive and not 10 minutes into the ride the car hesitated in 4 gear and then it backfired bad and died. After i coasted to stop, i tried starting it with no luck.my wife said she saw white smoke coming from passenger side tail pipe and smelled bad of gas.i had it towed home by AAA and here it sits,i really could use some help,were new to southern california and dont know any one . Help