Can't help you much but to tell you that I've heard that 69-74 351W cylinder heads are supposed to be the best years (69-70 especially). But the block itself didn't change much, so if I was you I'd go for 69-70 heads and a newer block. But thats only if the wreckers will seperate the two.
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1970 Mustang Grande
-351W
-270 deg duration cam
-Holley 750 dbl pumper
-Headman long tube header
-X pipe, walker turbo IIs
-150 HP shot of NOS
-Performer 351W intake
-Stock heades, machined for 1.94/1.60 stainless valves. Mild port job.
- 9.5 : 1 comp
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