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if you use this setup all your doing is moving the piston closer to the head and increasing compression ratio.
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Huh?
Stock 455 rods are 6.735", stock 425 rods are 7.0"
If you think that the extra .265" of rod length are
there for compression reasons...your wrong.
Compression ratio MAY be a bi-product of all of
this depending on piston choice and it's compression height.
What your doing is increasing the rod ratio.
So, yes overall 'stroke' is mantained but changes in the rod
ratio have an effect upon piston movement at both TDC & BDC,
which in turn creates changes in the effect of camshaft timing
events and the timing of the intake and exhaust charges.