In my reply, regarding duration, I did mead MORE, standard flat tappet duration. 6200 rpm isn't where that TP needs to be, the only way to increase the rpm, is with duration on the early cam lobes. The high flowing TP ports, weren't created for a low rpm engine and streetability was not their purpose, at all! They were a race head and that's how they need to be used. With a cam that peaks at 7000. I always wanted a set of SB TP's but, never found a set for sale.
Barry, was the cam checked for wear and timing? Also, in a car, the temp would be much higher and was the RT side A/F sensors disconnected and all the left side sensors hooked up?
Everyone keeps saying that "sound" is the reason people want that cam. You don't need a cam for sound, just pull the choke out and you've got that. For me, it's history, nothing else.
Here's a idea, why not hold a competition, using the "D" as the base line rule? That's kinda what the EMC is about. Are people interested in the FE because they are "modern" or because they are one of the best "old" engine. The FE is about history. You can add modern components to it but, basically it is a high end, historical engine, one of the best Ford ever produced!