[1968k20]

When I bought my '70 k10 last summer, I had to replace a bent pushrod before I drove it home. As 350's are famous for, the rocker arm stud was pulling out. So, today, I pulled the intake and heads off. Water has been mixing in with the oil, so I am going to rebuild it. Haven't pulled the pan yet, but I have a 350 4 bolt standard block that I will use for my '70! How rare is it to have a 350 4 bolt that's standard!