Subframe connectors

Hi all, new guy here. I've been working a project to restore a '74 Duster. It has a '71 340 4sp transplanted into it and just needs alot of fixup-type work along with some small structural/body rust repair, new interior, etc. But it sure runs strong!

So after I tore out the interior to rebuild the trans hump (amatueur attempt - yuk!) and found some rust holes, I decided to go ahead and do the SFC thing as long as the floor was all exposed. I think I found or developed a good way to get the 2x3 tubing in without much floor surgery needed.

I fabbed up the SFC with a front plate to butt the crossmember, as normal. I measured it out to extend about 8" back over the rear frame with an angled cut up to where the floor meets the rear frame. Now here's the trick part.

As many have noted, it will not go all way up before hitting the floor, maybe 3/8" to a half inch shy of seating down firmly against the bottom of the rear frame. So I made two cuts down the length of the floor ribs where it hits. Didn't cut anything out, just split the ribs. The positioned it in place in the rear with the front hanging down a few inches on a jack. I made one good weld across the bottom at the very rear, where it needs to be. Then I raised the front into position with the jack. I took a few good whacks with a sledge to get it up. The splits in the floor allowed enough flex for the SFC to go into position with just a bit of a bulge into the floor. Dropped a few spot welds into the SFC through the floor, welded it back up and completed the main welds all around the front and rear SFC butts.

Seemed to work pretty well, and I think maybe even tightens up the overall body interconnect by the tension of forcing it into the floor. Questions/comments?