LS eng guys, please help

[vht]

Set my 5.3 in today for mock up. It's a trk eng like the 6.0 I'm going to use. Looks like I'm going to have to do a little firewall work. I'm going to be between 6 and 6 1/2 in from crank centerline to the 2nd crossmember. That's measuring from the 2nd cm up to the center of the crank I should say. Will know exactly after I level the frame and set the eng 4 degree down, angle finder fell apart and had to go buy a new 1. My front spark plug is right in line with the spindle. The truck oil pan is going to stick below the cross member around 1 1/2 in. Anyone that has a ls in a AD truck, mine's a 51, does all this sound alright? I have a tci Mus II frt end with what is suppose to be 2 in drop spindles, and a 4 bar set up with coil overs in the rear. I don't have a clue how low this is going to set and with no frt end on it I don't know how close I'm going to be to the rad. I'm going to use a Champion 3 core but haven't got it yet. This is my 1st AD build and I'm not real familiar with these trucks so that's why I always seem to be asking questions. Don't want to have to fab something 2 or 3 times to get it right.