Good question...
I bought this head off ebay; a pig in a poke. Lucky for us, (Freddie and myself) the guy selling it was honest.
He said it was ported and had 1.75"/1.5" valves in it.
I paid him $700.00 for it, sight unseen.
When it arrived here (the seller said that it came out of a Dodge Van in a junkyard in Las Vegas!!!!) I took it to the machine shop that was doing all of our machine work (boring and balancng, etc...)
He magnafluxed it and couldn't find any cracks; pressure tested it, looked at the porting job and said i looked pretty good to him... he builds racing engines exclusively at that ahop. ) He tested it for flatness and found less than a thousandth of an inch variation from one end to the other, so, not wanting to make the combustion chambers any smaller than they were, I declined a clean-up milling. He agreed... said it had never been milled.
It weighs 84 pounds!!!
He gound the valves, putting a 3-angle valve job on it, using the valves that came with it, and back-cut them.
It's a drool tube head, which means you can get the lifters out of the engine with the head on. I guess you can't do that with the non-drool-tube head, although it (the later head) reportedly has a better combustion chamber.
We put a new set of 340 springs on it, with some pretty weak inners.
That gives us about 135 pounds on the seat and a little over 300 pounds, open.
Bet you're sorry you asked... LOL!