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These should be double hump heads. They are very sought after heads.
small block
you can find that type of information at http://www.mortec.com/
Most cylinder heads are made from cast iron or aluminum.
I was unable to find that exact number at mortec.com, however if you have a set of 3991492's, they are very possibly a set of 70-up LT1 camel hump heads with 64 cc chambers. These would be valuable heads.
The cylinder walls will be cast iron. The heads are either cast iron or aluminum.
I wasn't able to find that number at mortec, however I did find 3998993. Which is a 75cc head used on 307's and 350's since the early 70's. Perhaps that is the head you have.
Yes it will work the block bolt patteren never changes from 350 to 350. You might run into a problem with a intake manifold not going on though unless you have it too for the heads you want to use.
There 194 heads 1970 to 1980 heavy cast iron heads
You have to look up the cast numbers on the block to see what year model,there are also cast numbers on the heads, the numbers on the block are behind where the distributor goes in, numbers on the cylinder heads are in the centers on the top in most cases
The casting number is 0331
The Commodore is made of cast iron and both use two-valve-per cylinder iron heads. The engine was used in the 1991 second series by Heldon.