New Guy Question - What lift for 37" BFGs?

[IGOR]

Please welcome the new guy! - I've been a member of Coloradok5 since almost the beginning - but embarrasingly enough, just found this website - and to my surprise there are a lot of people from Oregon & WA in here - mega-cool!

I have a '72 K5 Blazer that I'm wanting to put 37x12.5x17 BFG Muds on -

Right now I'm putting an ORD shackle flip on the rear - it will be pretty simple to go to 8" at the rear right now with the old 4" blocks I have laying around.

Would 8" springs be sufficient at the front to fit 37s?

Or - I have some 6" Superlift front springs off a '75 Chevy 3/4 ton K20 - would these be enough?

Thanks for your help!