question on phenolic spacers

I have seen dyno sheets on a mopar and with adding a 4 hole phenolic carburetor spacer to a dual plane intake they gained 5 more horse power and 5 more ft lbs of torque. This was on a 408 stroker mopar engine. I guess it truely dpends on the engine and the intake and the carbuetor. I have a 300hp 375 ft lbs of torque engine wich is way under rated by mopar by the way... I read an article in a magazine where they got a 300hp 375 ft lbs of torque 360 magnum and all they did was add headers and a mopar m1 dual plane intake manifold with a demon 750 cfm carburetor and an msd ignition and they threw it on the dyno and it was putting out 319hp and 424 ft lbs of torque. I have headers on mine along with a dual plane edelbrock rpm air gap intake manifold and a 600cfm edelbrock manual choke carburetor and the mopar electronic distributer with vaccume advance. This is the set up i am running a 1 inch phenolic carb spacer on, and i am not running it to gain huge amounts of power, the main reason i decided i'd give a spacer a try is to keep the carburetor cooler (throttle plates) mainly and to keep the fuel cooler, and if running the phenolic spacer provides more power at the same time then thats great, thats all im trying to find out. And if it robs more power then its worth then i will take it off and find another way to keep the carb and fuel cooler. Thats why i posted this question, just trying to learn about it.