I am a firm believer that the frame ties need to go through or at least attach to the floor. I have the old weld in/bolt in MP (Comp Eng?) unit in my 4-speed car and they bend up and touch the floor when put the car up and the jack stands are under the frame instead of the control arms. It didn't do that when it had an eight point roll bar. If I was going to leave it without the roll bar I'd have to weld them through the floor to be comfortable. The car launches hard enough to bend leaf spring segments and I already had to repair the a-pillar to cowl joint once which entailed repainting the car. That was a ton of work that could have been avoided if my brain was functioning correctly when purchasing the connectors years ago. IMO any car that gets beat on should have them.