My good friend Al Deim walked me thru all of this years back - he made me some ignitions for special projects - the slick one -I wanted -was one with the coil mounted right next to the spark plug -just a few inches away -- and then a seperate box o electronics on the firewall - nary a glitch there either -
Some new cars are sorta the same - a coil for each spark plug then a basket of snakes to a computer