you dont need to use this adaptor. if you have a close look at the efi manifold with the injectors on place , you will see that the injectors are quite far back and dont get very close to the head. using a efi gasket from ford , mark the non efi head and carefully remove some meat where the injectors go . you should end up with about 3mm between the inside of the port and the edge of the face on the head - my 89 xr3i runs fine with this modification when i used its head for the turbo. i ran my sidedraught motor with only about 2mm between the port and the edge of the mating face on the head , and this motor saw 2 bar without a problem. looks to me that you will now have to do double work on the match porting and have twice the hassle with gasket blowing