Stupid question, where is the oil dipstick on a 84 350?

[Rifter_Chevy]

So i bought a new truck, noticed a oil leak on the passenger side of the block i assumed was coming from the valve cover and went to check the oil.

Well i cant find the dipstick, it has aftermarket exhaust manifolds on it so its probably safe to assume the previous owner removed the dipstick tube to install them and never reinstalled it. So i bought a universal distick tube and new dipstick thats supposed to fit any chevy smallblock but i cant find the hole in the block to install it into. So where is it on a 84 350?

Thanks guys.