There is a pretty heavy bar that attaches to the 403 enging block...The engine stands bolt to that bar...There are three bolt holes on each side of the block just above the oil pan...That is where the Engine stand mounting bracket attaches to the block...
However, I am unclear about what you are trying to do...IF you are trying to put these engine mounts on a 455 there will be alot of altering...They will not put the engine at the right hieght or position...I currently have my swap completed..I do have pics, and I will see about getting them posted...I can email them if you email me your address...My swap looks a hundred percent factory,and the factory ac is still installed unlike the other swaps I have seen...I have completely torqued the enine in every direction, and I have no clearance issues...My Email address is...
[email protected]
good luck...