I donīt want to spoil the party but your 400 hp to the wheels sounds a bit low to me considering your big cam and 320 cfm-heads. Why am i saying this? My 74 SD455 was dynoed with the original low compression heads and small 224/230 rollercam with 382 hp at the rear wheels. OK, i have a manual Tremec transmission that costs less power than an automatic but still i would guess that there is a lot more in your combo. I would agree with everyone here that setting the timing and the carb on a dyno could work wonders. In my case we picked up 60 hp! I mean it ran well but the engine builder had set everything very conservatively.....of course he wants his engine to last long after warranty and as long as the customer does not complain why not play it safe?....it is crazy what a difference especially the timing makes...
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