Take out all your spark plugs. Remove the relay for the fuel pump or fuse for it and remove the fuse for the coils or ignition module. Then crank the car and see if anything comes out of the spark plug holes like coolant or fuel. You could have an open injector or a coolant leak from the manifold. Or possible flooded motor due to coolant from the last manifold. Either way its to empty out the cylinders of anything that could be in it to begin. After try to start it reinstalling everything u removed and check to see if it starts normally
1996 Mustang GT, 17x9 front and 17x10.5 cobra r replica rims, 255/40/17 front 285/40/17 rear at the moment,
o/r x-pipe flow master 40 series dump downs, cai/ram intake, 75mm c&l throttle body and plenum, pi heads and intake swap, msd wires, stock gears, untuned at the moment, no dyno numbers for now.