Beginner Road Track Racing: Feedback on Engine Options Wanted

If for just fun and learning, what rpms will you most likely reach at top end in high gear, you at least want to be able to turn that, doesn't need to make peak there. As for torque you want the most you can hook up and control, A milder engine that can breathe to the rpms necessary probably better for learning, your chassis setup tires and brakes and diving abilities are gonna matter more than 50 or so hp. If need over 6000 rpms I'd probably get a 5.2l magnum refresh add a decent cam (reground?) air gap and headers and call it a day and if need under 6000 rpms get a 5.9l.