Here is my solution to installing a carburetor intake on a FI head. I was going to drill the extra hole and tap it as directed by many people on the forum but, for some reason, the intake port would not line up directly over the gasket surface on mine. So I opted for a different solution. I used the metal tabs that are used inside the crankcase to prevent the bearing from coming out. It just so happened that the bolt holes were the right distance apart (I had two extra engines so I had extra parts). I first used one of these on each side of the intake. It worked fine until I fit the carb to the intake. The piece I had installed on the front head was obstructing the movement of the throttle mechanism so that was not going to work. I finally decided on using a piece of metal that I bent into a stepped shape at 90 degree angles. The pic should show what I mean. I then used one of the small dowels meant to line up two halves of the engine as a spacer I had to cut it down a bit. I cut the dowel just a little shorter than the thickness of the intake port so the bolt would pull it down tight. I also drilled a recess into the intake port holes into which I press fit a nut into each side that the bolt would thread into. I'm not sure my explanation is quite clear so I'm hoping the pics will fill in the gaps.
I also bought some gasket maker at NAPA. Here are the pics of the gasket maker and the solution I came up with. I haven't run the engine yet but I'm pretty sure it'll work. An advantage of doing this way is you don't have to drill into the head, you use the existing bolt holes on the FI head.
Recessed hole with nut pressed into it
Carburetor Intake Port bolted onto existing threaded holes of FI heads. Notice the stepped metal peice on the right hand side ( front of engine)
I also bought some gasket maker at NAPA. Here are the pics of the gasket maker and the solution I came up with. I haven't run the engine yet but I'm pretty sure it'll work. An advantage of doing this way is you don't have to drill into the head, you use the existing bolt holes on the FI head.
Recessed hole with nut pressed into it
Carburetor Intake Port bolted onto existing threaded holes of FI heads. Notice the stepped metal peice on the right hand side ( front of engine)