Ok, here's my suggestions to rev a boosted 292 to 7000+:
Keep the overbore to a minimum and fill the water passages with HardBlok to stabilize the cylinders which will assuredly want to distort when you pour the coals to 'er.
Grind the crank journals with a big cheek radius and heat treat and balance the crank.
Do a search on what people have done to keep the flywheels from shaking loose and harmonic balancers together.
Use lightweight aftermarket rods and forged or hypereutectic pistons.
You don't want an engine that will rev to 7000 - you want an engine that will rev to 7000 REPEATEDLY.
Good Luck. Post pictures of your progress.
