K frame install alignment?

Hello,
I am about to weld my radiator core support into my 71 Duster and I'm installing my K frame to try to make sure the frame rails are as square as possible prior to the weld. My question is are there any alignment concerns to bolting up the K frame? I did not remove it, is is just metal to metal, no bushings I assume? I plan on removing the /6 torsion bars as a 340 will go in this eventually, any suggestions or comments would be appreciated. Thanks in advance!!