So I'll be running with a stock block L98, only changes will be a much less restricting intake and exhaust. So assuming the intake and exhaust will well exceed what the rest of the engine can flow, what would be an estimated rpm ceiling? Also, should I replace fuel pump for this or will it not be a limiting factor? (I have no intentions of adding anything else to the engine any time soon.)

 

Would you clarify stock block L98. Do you mean stock and/or original valve train in your motor?

 

Yes, the motor has not been changed from the factory.

 

If it was my own can I would.

Stick with the RPM range indicated on the stock gauge in your car.

Things to consider. The springs in your valve are 25+ years old they will have fatigued. Weak springs will let you go into valve float easier than new strong springs. This can allow the valve to contact the piston. When that happens 9 times out of 10 things get bent which in turn is a very expensive repair.

thats just my