What do you guys think of the speedmaster bare aluminum heads

That they sell?

Like this one for example, though some are listed much cheaper.

Mopar Chrysler SB 318 340 360 170cc 65ccCast Bare Aluminum Cylinder Head 12933010742 | eBay
There was a set on ebay that was 550$ with free shipping. Id think for that price would price you couldnt go wrong, considering the price some of these people want for 40 year old used heads. Lunacy.

Jake