Which side they came from, where the push rods came from and if you remove the rockers remember which rocker went where
That's what should be on it.
These should be double hump heads. They are very sought after heads.
the heads should fit as long as your not trying to put them on a big block
Yes, they should fit ok. 305 heads should bump up the compression a little.
they came with "186" casting number heads.........
Yes they are the same heads.
There are many places where one could purchase small block Chevy heads. Some of the best places to purchase small block Chevy heads at places like Amazon or Auto Zone.
Yes, and well.
NO.
Yes they will, but 305 heads have a smaller combustion chamber so it may raise your compression ratio.
The manifolds mount to the heads, and are pretty much interchangeable throughout the life of that engine. There were two different bolt patterns used from the factory, and most heads are drilled with both. It's a pretty easy fix to add the missing hole and tap it if you run into that problem. Just remember that you must use gaskets if the heads are aluminum.
Yes, they should bolt on just fine. Might get a little more low-speed torque with a decrease in top-end horsepower.