Just went through the this with a set of magnum heads I used on a engine for my Barracuda.They were new castings, but I would have never used them if they had a lot of miles on them due to the cracking problems.
The biggest problem beside the cracks is the valve spring selection. If you are going to retain the stock valves like I did there are only a 2 or 3 choices, and I had to buy seat and guide cutters to get the installed height and retainer to guide clearance right.
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clean up the valve guide boss, open the bowls, and remove some from the pushrod pinch, and you've got a 230 CFM head. especially if you upgrade to the 2.02 valves over the stock 1.92
Yep, I spent a few evenings working on mine and got them to 230 @ .550 with 1.92 valves.
