What tires are you running? What trans - auto or manual? What rear axle ratio? If its an auto, do you have a stock stall or a high stall converter?
Without that info, its hard for people to help you. I checked your Tech Tray, and your profile, and there is no info at all, other than its a 95.
Edelbrock makes replicas of the LT1 and LT4 intake manifolds. They are virtually identical to stock, except for 1/4" LONGER (not taller) intake runners. They feature the "air gap" that is supposed to reduce the preheat in the incoming air charge. It has been speculated that creating the "air gap" actually reduced the plenum volume, on a manifold that is already too tight on volume. Tests so far have shown no significant difference between the Edelbrock parts and the stock parts. The main advantage of the Edelbrock LT4 manifold is that they actually make them, while GM has stopped producing the OEM LT4 manifold.
The Edelbrock LT4 intake has the 1/4" TALLER ports, but it will not work with the stock LT1 heads, because of an interference between the valve cover rail on the LT1 heads, and the taller runner castings on the LT4 intake.
QUOTE
Utilizing the proven short-runner tunnel-ram design for 1992-97 LTI and 1996 LT4 engines, these manifolds incorporate a .250" longer than-stock runner and out patented Air-Gap design that delivers a cooler, denser air stream for maximum power from 1500 to 6500 rpm. The throttle bore inlets are cast larger than stock to accommodate our 52mm throttle body #3809 or our 58mm throttle body #3810. The LT1 version, #7107, is designed for use on factory LT1 heads or Edelbrock Lt1 heads #61909. #7109 for the LT4 is machined with a .250" taller port designed for use on factory LT4 heads, Edelbrock LT1 heads #61909 and the new Edelbrock LT4 heads #61939.