Optimum air speed and other dumb questions

Car is around 1300kg (2866 lb) and going down

historic road rally car working within a rather restrictive class, 273ci plus whatever bore is required , around 880cfm carburession (slightly more metered than the average holley) 10.5 comp. limited to a torqueflite (but that's not all bad) aiming for a strong pull from 4000 to 7000 but to hold past 8 would be nice.
Between 3.45 and 3.89 final drive depending on the day