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Johnson are great but might require adjustable push rods as you have to have the length spot on. They apparently free up 20-28hp. I'm pulling this from a recent thread i read i don't know much about them personally. Most use ls7 lifters. The btr springs are supposed to be replaced every 25kish miles if you have a high lift cam so figure out howe many miles are on yours and make your decision from there.
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Whipple 2.9 CAI ID1050x injectors ZL1 Pump JRE FPCM JMS Voltage booster JRE Rough Idle blower cam BTR .660 springs CHE trunnion kit 1 7/8 Speed Engineering Borla Atak JRE scoop 1.5" lowering springs BMR trailing arms and toe links Cradle inserts 704WHP 603WTQ 93 octane
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