Richard I think Don is right on the money for production 351W heads. My knowledge is about the same as your on the SBF's but I do know the C90E-B or D, D0OE-C or G, D0OZ-C and the D5TE-EB heads are pretty good. All of those have 60.4cc chambers and stock 1.84/1.54 valves. In 78 the chambers grew to 69cc's and those were D8OE-AB. With the D8's you'll lose some compression and valves were smaller at 1.78/1.45. A bud of mine is building a 408W with some AFR heads and a snotty roller cam. He was going to use the D5 truck heads as they came on the engine core he used. He's over 600hp and I'll see what flow numbers he has. The GT-40 heads that Steel mentioned are also good. I think they they have larger valves (1.94/1.54) and with flat tops you'll need to notch the block for clearance I'm sure. But i'm not certain what size the chambers are. I'll do a little more checking and see.

G.