FB_MItch

So I just completed my first rotary rebuild today on my 79 12a. I had to get some used rotor housings that were usable as mine were totally gone. The ones I got are from an 81-85, the engine went together just fine and the header gasket and stuff fits just like normal but neither my 79-80 intake manifold or my 81-85 intake manifold fits the damn thing. The 79-80 leaves a huge gap at the bottom of the intake port on the intermediate housing and will not go flush with the engine and the 81-85 just wont go on all the way but the 81-85 doesn't fit my carb anyway. So I was wondering what I should so and if there even is an intake manifold that will fit this setup. I appreciate any help and look forward to hopefully getting a solution.