Obviusly the answer is the biggest engine you can afford. To answer your question; A properly built BB Chevy of any size will turn the rpm you are asking about if the heads and cam and complete valvetrain are compatable to the rpm. I know of several 880 cui n & 890 cu in that are spinning above 8,000 rpm that are in Pro Mod race cars. I know of one 762 cu in that by accident went up to 9,000 and lived. IT is nothing to turn a 632 to above 8,000 rom if it is built for it. I would do a 622 before a 632 though.
To get the low rpm torque you may want even with a big engine, you will not want huge heads or a huge cam. A good tall deck block with a decent rod/stroke ratio for longevitity.
Anything else you will need to be much much more specific. The sky is the limit if you have the budget. All my customers are poor boys so we have to budget everything we do pretty tightly.
Ed