That looks like a beta motor sports 2jz mount, given I think the actual one had the L brackets upside down as to how you have them to prevent the engine from pulling the frame rails from the fenders.
And ok. I read that completely wrong. I read it as moving up an inch not forward by an inch.
Moving the mount forward is possible although keep in mind the angle the bucket is welded on will change slightly if you are trying to hit the same point on the LCA. On a lower control arm like the GTX-2 unit it probably won't be as big a concern since the tension arm locates on a pivot so the angle of approach will be more or less indifferent. The problem will be the force vector under breaking. Moving it forward an inch shouldn't disrupt it too much I imagine especially if you go with a LCA with a pivot point attachment rather then an L type attachment. The problem will be your overall angle would change.
Example if you make a straight knife hand to represent the wheel and use your other hand to poke the center of your palm at ~45* and apply force backwards toward your body with your knife hand you are recreating the force the tension arm sees. Now tilt your poking hand to a more perpindicular angle and you will find the your wheel hand will try and pivot backwards easier while your poking hand is going to want to buckle. The concern would be more stress on the tension arm.
Newzed's remark does beg the question though. Is the reason you can't put the bucket in a factory style location is because the slope on your new frame rail starts too soon preventing you from going further back? If so I would be tempted to just notch the new frame rail and put it where it is factory. Most control arms seem to hit further forward for more caster, rarely that much shorter.
Edited by seattlejester, 21 February 2017 - 09:22 PM.