I know this might sound a little silly, but what I did was use 2 blankets.. One in the correct position and then one in front of it that covers the bell housing.
The blankets are about 89.00 from Summit and a whole lot easier to install than the shields. I have one of shields but I'll be darned if I could make it fit in under the floor covers.
The biggest problem you will have is that the Turbo 350 and the dana 20 dont leave a whole lot of room to get the blanket or the straps around the bottom without driveline interference. Good luck, it's a pain in the arse!, but I was able to do it.
By the way, I was right behind the guy who had the transmission explosion last year. I think this is a good rule. We/he are lucky no one was killed!