I have a small or serious problem

I think it is practically impossible to weld it in the necessary position. In manufacturing, this support has a very exact position with a minimal tolerance (possibly centesimas or thousandths of millimeter) .If the engine is displaced above the tolerance there is a danger of suffering the gearbox the transmission, ...
I do not understand welding, but it will have to endure heat+vibrations.

If you can let go and adapt any type of support, no problem does not affect you at all, you will put it well, but if it can be completely feasible to perform there is no problem, in my workshop we adapt many engines like 120 and we did it abiastly, you have calm that there is no problem, a grove that does not bother to get anything or filter or anything.

Well, before all the welds that go in the vase of cars are due to reading electrics plus an antimony aletion which are thrown and designs to put up large loads and sprays and if you think put or weld with ordinary welding such as oxygen the tig does not arrest you