The only complaint we had was from a guy who had a pretty rowdy 327 in his 69 Camaro that had a rod that wanted to see daylight. We put in the 375 hp 350 from Blueprint. When he picked it up and started it for the first time he was disappointed with how smooth it idled. Needless to say he was pleasantly surprised with the driveability and when he got on it the first time he was amazed how it pulled right up to 6k rpm. Another added benefit was enough vacuum to run his brake booster.For the money it’s a no brainer . New block with roller cam . Aluminum heads 5 year warranty that doesn’t void because owner installed . Hope to install it in the next few weeks