Some what related. I've got a 67 Nova with a Heidt superide. Power rack with a LS1 motor. I had to move the motor mount up so the pan would clear the rack. And yes it messes with the drive line angle.
I think the Fbody pan is actually thinner than the AutoKraft pan at the area over the rack. The superide rack is in front of the crossmember. I had to use the Autokraft pan due to the Superide rear mounted sway bar.
Long story short last summer I had a LS3/tko600 in the nova. Autokraft pan. The tko required the tunnel to be cut allot. Since I had a nice LS1/4L60E sitting in the shop I pulled the LS3 and put the LS1 in. The 4L60E required very minimal tunnel mods. I dropped the LS1 in with the fbody pan and it cleared the rack only because I raised the mounts for the LS3.
Double check the pan dimension comparing the two. By the way the Autokraft pan is a nice and has worked well.
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