Engine location

[scpls19398]

Good morning all, I am working on a project instlling a tr engine in a Fatman Fab front clip for a second gen Camaro. After setting the engine into the frame and locating the transmission i have noticed that the cl of the crankstaft is a little over an inch off center while the transsmission is centered. my question is should i move the engine over to center it in the sub frame? I am hoping it should be centered as the TA headers on the pass side is going to hit the lower a-frame mounting bolt but will clear if I slide the engine over to the center and slide the engine to the rear about 2.5". I also need to know if sliding the engine back 2.5" is going to cause firewall clearence problems. thanks