For Deve, first off I am running a V8 with a different crossmember than original.

When I installed my m/c and booster under the floor I did have to cut a notch out to clear the very end of the m/c.
However, I was surprised to find that instead of being hollow inside there was a 1/4" piece of flat steel "standing up" inside the hollow crossmember. When I trimmed out the member I barely had to cut any of that flat steel. I was impressed! The crossmember came from Chassis Engineering.

Now that I plan to put a 700R4 in my panel I will be moving the crossmember back four inches and it will clear the crossmember.

Just FYI... and here is a pic.

http://i140.photobucket.com/albums/r19/LutherParris/52Panel/Crossmembercutout001.jpg

http://i140.photobucket.com/albums/r19/LutherParris/52Panel/Crossmembercutout004.jpg

Just to be on the safe side you can see a gusset I welded to the bottom side.

1937 Chevy Pickup
In the Gallery
1952 Chevy Panel
In the Gallery
More photos
1950 Chevy Coupe
Pictures!

I'd rather walk and carry a Chevy hub cap than ride in a Ferd.
I can explain it to you, but I can't understand it for you smile