Edelbrock LD340 Intake Manifold Usable Max RPM?

273 said
If your choice is factory or LD340 it is what it is, obviously the LD340 is the way to go.
What mods are you allowed to do? people will cut the intake up in quarters and cut access holes everywhere to port them out it's up to you and the rules how far you take it.

The only allowed modifications to the intake are a shallow gasket match, to smooth any casting flash, and to notch or remove the plenum divider. No drilling/cutting/welding, no deep porting.

273 said
But he's only allowed to run that manifold for his class or stock.

I appreciate you focusing on the context of the thread and your constructive responses.

273 said
How much HP is required to be competitive in this class ?
Are similar cid engines spinning 7000-8000+ rpms ?

If you get the lbs-ft per cid up there you can make the power at lower rpms.

I'm not sure what power and where the really competitive cars are making, but most drivers I've talked to are running at around 7K RPM. I know there's a 360 AMC Javelin turning 8K, but he is the exception and doesn't run up front. The minimum weight for my car is 3,100 without driver, and I'll be able to hit that.