A KE20 crossmember is not the same as a TE27 crossmember.
Going by the assorted various posts above, it may be possible, I don't have personal experience of that.
If it does fit, it is likely the engine position is not optimal. Having seen a genuine TE27, I can tell you there is very little room to spare once the brake master and carbies are in position.
The top crossmember is TE27, bottom KE20
The angle of the insulator block face is different, and the towers they sit on are from memory, further forward and sit lower. To hard to get out of its current storage site but sure that's right. To do it properly, you will need to reweld the crossmember.