Bad luck with your engine, sorry to hear......but get over it.
Getting tailgated or flipped is common place these days.
You chose to try and out run him. Bad decision, and dangerous too......and with your Mom in the car.
The police will not press charges. Nothing at all will happen to the 240 driver. You will have to fix your car on your own. Believe it and get on with it. You will get another chance to drive again and maybe next time you will be better prepared.
Next time someone gets in your face and you can't get away, first pull over calmly, wait for him to get out of his car, flip him off, then speed away towards the nearest police station.......or you can carry a big club like I do.
The cops around here actually prefer that you beat them up real good before they arrive on the scene......and if you shoot him only do it once, because the second bullet will put you away for a long time but only one will get you off with community service.
....hey you were just protecting your Mom.