Streetmaster 318 vs. Performer for street use

I ran a streetmaster for about 4 years.Mine was gasket matched to 340 size,because my 302 casting heads were gasket matched.I noticed that the streetmaster was good from idle to about 4500 rpms,were it fell on its face.The cam i was running was good up to 5500,and had matching valve springs.As far as your carb goes,it sounds like the secondary spring is too weak.I would buy a secondary spring kit,and start with the strongest spring first.After you get the carb tuned to your engines liking,start tuning the distributor.Your vaccum and mechanical advance need to be adjusted to get the most out of what you have.You may try to adjust the vaccum advance first to see if it helps with your bogging problem.All it takes is a allen wrench(7/32 i think).Turning counter clockwise quickens vaccum advance,clockwise slows it.