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IMHO, I agree with Oldsmaniac, you have to watch what you're doing mixing parts with a 425 since it is a 45 degree engine. The big blocks were changed to 38 degree in 66 to fit in theToronado. There's also different lifter sizes to watch for in the Toro engines. I doubt the 455 intake will work. Do your homework, lots of info out there if you dig for it. They also changed the crank bolt pattern for the flywheel / flexplate somewhere around 67 or 68, something else to watch out for.
The 425 is a good engine. It will make many a Chebby owner blush.
I'm surprised that nobody mentions the big block oiling problem and the need for restrictors to the upper oil passages. Lots of Olds cranks toasted from lack of oil at high revs.
I feel the short stroke 425 could rev faster, no load, but the 455 torque wins under load!
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