Originally Posted by oldbogie
You need to look and see what heads are on the engine, it is unlikely that a stock 350 has heads with 1.72 intakes.
The 441s are no improvement over stock 78 heads, they are large chamber low compression heads with the added disadvantage of not having hardened valve seats for unleaded fuels.
lots of trucks came with casting 991 heads which was a 1.72 intake valve. there are other castings that did too, but thats a very common one.
but i agree, he needs to see what he has first to decide if it's an upgrade to put the 441's on or not.