Technical Shackle bolts Grade 7?

I am putting new leaf springs on my 39 Plymouth build and a Mopar Reproduction company has brand new shackle set with Grade 7 bolts. I see everywhere that Grade 8 is recommended alot and some say a Grade 5. This build has a 354 Hemi and Mopar axle will the grade 7 be sufficient? Thank you Joe

 

I have never heard of a grade 7.

 

Here is a comparison between grade 8 and B7 so you can make your choice with a little knowledge
https://www.aatprod.com/b7-vs-grade-8/

 

I bet the OEM bolts were Grade 5 to save $$.

 

8 is the choice...anything that steers , is suspended , and stops...