shackle angle?

[74 chev]

what is the i ideal scackle angle on front springs? i was under the impression that a verticle or slightly angled back was ideal but after reading some posts about the 52's swaps which im looking into im not sure.
hopefully you guys can help clear this up for me.
Thanks,Craig

 

[tRustyK5]

Ideal IMO would be about 20 degrees back from vertical.

Rene

 

[Poohbair]

Not sure what is IDEAL, but here is mine w/ the 52" spring swap and the shackle mount relocated.