What block do i have 2 bolt or 4 bolt

[Slime]

My 96 3/4 ton has roller lifters

 

[99xcss4]

all vortec 96+ are roller some tbi blocks 87-95 have roller provisions some do not and most if not all tbi engine that were used in car applications were roller

 

[n2xlr8n]

Just to add to this excellent thread:

My 1989 Silverado 4x4 block was-
Engine ID: V0930TPA (K vin L05, Flint plant, Sept 30, 1988)
Casting # 14093638
It had the spider bosses tapped, the cam retainer bosses tapped (wide version).

I just dropped the pan, so I'll report back if it's 2 bolt (likely) or 4 bolt main when I get it out.