I would do the following,
Measure from the cowl bolt, the very top bolt for the fender, and measure to the opposite corner of the hood opening. This measurement would be for squareness of the front sheet metal.
Secondly, at the front of the car, look straight down at the harmonic balancer. It should be directly over the little channel from the main crossmember to the front member. Any difference would mean two different heights of the chassis stands, thickness of the vibration mounts, or the transmission mounting is askew.
If you saved the old radiator support, I'd measure the two and compare hole locations as well as the mounting pads on the frame.
If all else fails to show any deviations, you might have to get a BB shroud to compensate for the relocation. But, general rule of thumb, a SB car, everything is centered.
Everett "OBJECTS IN THE MIRROR DISAPPEAR UPON RAPID ACCELERATION"