1969 C10 Front Bumper Height

[RMBillings]

My son and I are building up a 1969 C10 and need some information we can’t seem to find. Does anyone know the clearance dimension between the ground and the bottom of the front bumper. We are trying to figure out if the guy before us put lowering springs in. We replaced the 6 cylinder with a 350 and it is sitting really low. Just trying to figure out what springs to order to make it a little higher.

Any help would be appreciated. Thank you.