What I found out about my build was even after doing a 2" body lift modifying the heater box was a must. I don't know how you're putting the engine in (with or without the trany), but if you use Duff headers you will need to install the driver side header and lower the engine in with the header on. I found I needed a little extra room to move the engine around to get it to fit. With the heater box modified it allowed for that extra room. Also, once I hooked everything up (driveshafts, T/C, etc.) the engine actually moved back a hair and with the heater box being modified it was no problem. If the engine is out, and you a have few extra hours you might want to do the mod. Just some food for your mind.