Wanting to know who has the best subframe connectors for 71 camaro that I will not have to modify my floor pan.

The bolt on competition engineering ones do not require floorpan cutting the weld in ones do. I think you have to use the weld in ones if you plan on doing the leaf spring relocation. I havent used another brand there may be better the other 2nd gen we did we made our own(all cut out now the car has been tubbed)

I saw some on Powerblock.
Look through Detroit Speed, they had some that (looked) pretty straightforward to install.
Hope that helps.
~Sean