440 power gains/ aluminum head advantages?

65 Cuda 340 said

I would sure double check this if you haven't already.

And I assume that 800 Holley is a double pumper? I don't think they make a vacuum secondary in that size, but if it is a vacuum secondary carb, the secondaries won't open all the way if the secondary spring is too heavy.

Just thinking maybe you should check the simple stuff first.

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yes double pumper. and a/f gets a little lean at wot but not anything crazy. it's around in the like 13s. having slack in the new timing chain i put on makes me suspect. any recommendations on a good timing set to buy that should install with minimal slack? would a gear drive be more precise? it's never been line bored in either cam or main journals so it shouldn't need anything crazy. not that it should if the line bore was done correct anyway lol