you car originally had the cast aluminum stands and tall round mounts?
What year is the chassis?
There is no differance in the blocks. For that matter, the block thats in my car is from an 87 and mine is a 90 chassis, bolts right up. Toyota never changed the 7M block. Even the 7Mpowered cressida's were the same just with different mounts and stands.
Something else is wrong in your situation.