3K vs. 4K GSK

my truck is doggy in that rpm range no matter what timing 15, 20, 25. from the 3k kit i had to both the 4k kits ive had i only gained about 2 maybe 400rpms

go with 4ks I noticed a big change in low end response
 
Thanks guys! I'll probably end up getting the 4K and 60 lb. valve spring package. I am planning making this truck have around 300hp or so, nothing crazy, just a fun DD. Thanks again for all replys!
 
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