[74gpman]

ok lets see if anyone can help me out. I have a 1974 pontiac 455 with stock 4x heads. I am soon going to be doing a "performance" rebuild on the motor using edebrock performer RPM parts. My dillema s that the aluminum heads cost more than the rest of the parts for the rebuild combined. Now please understand that I am a college student so funds are always low...lol. Now my question is : can I use stock 400 4x heads with the 98 cc chambers to replace my 114cc 4x heads? Now im not sure as to wheteher A. the 400 heads will fit my 455 or B. how much performance I can expect to gain from this swap. Im looking to get somewhere around 400 horsepower out of this motor. thanks all!