US CAR TOOL Frame Connector Questions

I bought US Car Tool connectors and will be installing them
in the near future.
I will be fitting these then bolting them in until I can get it
to a shop for final welding.
Any advise on brake cable and lines, fuel lines and exhaust
problems that will arise.
This is a 70 Dart, stock fuel tank, Hooker headers, H pipe with
full 2 1/2" exhaust and a driveshaft loop.
I have not ran the fuel/brake lines or installed the exhaust although
I do have it all.

I also added some pics of MP connectors that I returned to Jegs
for reference between the two different types.
The return was because the MPs looked anemic and the welds
were not good and some were missing altogether.