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I'm looking at a forged crankshaft for a 292 from a 1969 motor. Will this fit my 1979 motor? Are all the parts still interchangeable?
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It will fit. The forged crank was an early one with fewer counter weights. Most builders have opted for the later fully weighted crank but as with all things there are different opinions. It depends on what use the engine will see, really see. 
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
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Working on building a higher HP 292. would like to spin 8k+ rpm. I've heard the newer weightier cranks wont spin that fast. Or at least not for long. I would like to get to 10sec with my 63 Nova...
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That is far beyond my experience but others here will jump in I'm sure. Have you read Leo's book? There is a section on cranks.
"I wonder if God created man because he was disappointed in the monkey?" Mark Twain
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I've heard the newer weightier cranks wont spin that fast. Or at least not for long. None of them will last long at that RPM, but the fully counterweighted cranks are better for those high RPM applications. Our NHRA many time national record holding 292 powered Chevy II left the starting line between 10,500 RPM and 11,200 RPM and was shifted at 7200 with the fully counterweighted cranks, and the cranks lasted no more than (20)quarter mile passes before they broke. The forged cranks lasted fewer passes than that. We contacted Crower about making us a billet crank, and he said, "Save your money, because even a billet crank with the 120° firing sequences and damaging harmonics these engines have wont live long at those RPM's either!" Its doubtful your cylinder head will make HP about 6000 RPM to begin with, so trying to turn it 8000 RPM is an exercise in futility and a deep money pit as well as completely unnecessary to make good HP with of these engines.
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I think you would be more ahead of the game if you Turboed it. And you wouldn't need that kinda of rpms
Larry/Twisted6 [oooooo]  Adding CFM adds boost  God doesn't like ugly.
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Very heavy SEMA S.F.I 18.1 damper specific to this engine.
Dowels in the flange?
No, you don't want to see your crank under the car.
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Thanx for the info guys. I do still want to get the max HP out of this engine. Naturally aspirated... I'll put the money in one time. Long time dream!
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RPM is to be avoided whenever possible. If the VE isn't there spinning it faster makes less power.
Why do people keep saying turbo, blower etc.?
Because it works better than anything else.
I have a 520 hp 183" L6 turbo engine in a street car.
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Blown is another option... I'm looking into that also.
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