here is a nice rpm chart i found:
http://www.chevellestuff.com/generic/rpm_calculator.htm

there really is no perfect ratio for all situations
but this is an excellent chart. there typically is some rpm inaccuracy on auto trans, i've heard.

i'm going for ~5300rpms (max hp) in 3rd @100mph with my 200-4r and OHC6. should be a fun experiment? i'll only get about 30mph in 1st though. prob'ly no good for an auto-x... i love torque we'll see how much i can stand.