Motor mounts and towers?

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I have a 1987 TBI motor going into a 72 LWB C10. The problem I am having right now is I have normal small block towers and new rubber mount, but the stock exhaust manifolds are hitting the frame when it still lacks about a 1.2 inch to bolt up. My 68 has a big block in it and the mounts are different. What kinds of towers do I need to run in order to get my clearances with the stock manifolds for the 87 350? Should I just run the ram horns and forget it or is there another solution. Right now if they were to bolt up as is the motor is leaning back like the trans crossmember is to low when it isn't.