torqueing mains and treads came out. now what?

Guitar Jones is right. It needs to be heli-coiled on a Bridgeport to ensure that it is perfectly perpendicular to the mating surface of the block.

As far as everyone's concerns about the strength of a heli-coil, they are much stronger than the original bolt hole. I'm shocked at some of the responses here suggesting to get a new block or tapping it oversize.

Too much mis-information being thrown around here.

I have personally done helicoils on main bolts IN THE CAR. Not my first choice, but I was trying to bail out a dumbass mechanic that didn't want to pull the engine out. It sucked to do it, but it worked.