I would listen to these guys, just had a conversation with a friend of mine yesterday and he has 210 heads and installed the MSD EFI kit wanting better fuel economy from the motor. Well low and behold talk to his engine builder and it does not work because the heads are too big and he is just filling the motor with fuel and not burning it fast enough. Motor was built to run around 3K but going down the highway he is only ay 2k....So he has to either change rear gears or go to smaller heads to get economy versus more of a power motor...
Something to consider..
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