4 inch lift

[nate 71 k20]

Hey guys so I'm brand new to this forum I have a 71 k20 really mint truck daily driven and it rides...well like a 71 k20 so I traded some old parts for a set of rancho 4 inch front springs so I ordered all new lift shocks stearing arm lift block and 2 inch rear blocks cuz my truck has some bad rake but the problem is I found out there 85 k5 blazer front springs witch I read are about 2 inches shorter. My question is will they work with my stock shackles or am I f*cked?