As a side note ANYTHING you do to improve a motors VE will help no matter what it's output and intended use ie: port job.
With all of the mods done to my motor it makes great power and torque off boost and this helps everyday driveability and getting the whale moving.
Even without the...
My take on the BBC springs: I'd be concerned that a spring failure means losing the motor as it will drop a valve, at least with duals there's some redundancy.
Point in case>
There are variations car to car due to tolerance stackup during production and while it isn't a huge amount it's there and this is why the shop askes you to measure your particular car to be sure.
I measure from the Seal on the Trans to the bolt centreline for the centre bearing and then from...
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