OKI just did this, pulled aChevy and replaced it with a Ford, I have the 4 point system with the front and rear motor plates bolted to the 3/8 angle with mounting blocks. I had to cut the front and rear plates down to get my motor to set down between the stringers. The main object to motor alinment is to center the drive shaft with NO tolerance left or right and the most important factor "no more than 3 degrees angle from the front of the pump to the front of the driveshaft" With a Ford you sometimes have to raise the front of the motor to get this angle correct. Also you cannot have a perfectly a flat angle on your driveshaft, it must have some wobble to luberciate itself. To properly position the motor fore and aft stab the pump with the splined end of the drive shaft (HBar) as deep as it will go on the input shaft of the pump, then pull it forward 3.8 of an inch. This will allow the crank to float, which is a necessary thing. Hopefully you can see in the photo, how much I had to cut my front mounts to get my motor to line up. Hope this helps, George at ARS is a great help, and will talk you through any problems you might have.
