A-Body Frame Rail Connector

I have installed XV Motorsports frame connectors on my 70 GTX B Body and they fit like a glove to every contour on the floor pan. I had very little final grinding to make them fit perfect. i tacked them on with the car leveled on 4 adjustable jack stands then i raised the rotisserie and finished the welding in a comfortable manner.
At the same time, a set of US Car Tool frame connectors were being installed on a 69 Dart in the same shop I am working in. That install was much more of a pain. Lots of grinding and HUGE spaces where the connector was not going to meet the floor by a long shot. These spaces were probably engineered into the piece for brake/fuel lines and such but they sure seemed like overkill to me, besides, they then left HUGE gaps for dirt and debris to get in there and cause rot!
For my $$ and time I would use the XV parts again. I am sure the end result....stiffening....is the same with either product.
Here is alink to my build over on bbodies only. If you scroll through the pages you will see several pics of the frame connector install.
http://www.forbbodiesonly.com/moparforum/showthread.php?t=1121