The blue masking tape line, indicates the center spindle/wheel location realtive to the motor position. I cannot wait to get this car back on the ground and some scales underneath it.. With the Crossmember/Suspension kit, and the firewall kit we have coming out, the position of the motor looks promising. Everything is open and easy to work on, and the overall suspension/engine weight, will be about 25 pounds heavier than the OEM suspension and engine. Our LS motor actually sits several inches further back, and a bit lower, than the original motor, so I am hoping it is all atleast a wash or better when it comes to over all weight affect.