410 ci motor info?
If your loking for ways to improve the motor, the first and best thing you can do for an FE is lose the log style manifolds, and go with either the 406/427 cast iron headers, or traditional headers. The manifolds are a major bottleneck for an FE. Im sure some of the guys around here can tell ya what you can find that fits your particular car.
Those that say it cant be done should say so quietly, so as not to disturb those who are doing it.