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chris,what dave says is true ,on the power valve.i have run a 292 solid cam and a 4.5 power valve runs well with them.usually you will need a 31 shooter up front, to help on the starting line.set your fuel pressure up to 7 psi.i dont think that has anything to do with your launch,but it will help down track.you may also have to put a piece of fuel line on the breather tubes on the carb.it will help from dumping fuel in the secondarys when leaving hard.also a worn cam or pump lever.after that if you still have it, recheck timing and change the spring in the vacume canister for the secondarys.
 
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