Hi!
My car are real weak before 3000rpm but runs quite good up to 5500 byt maybee I chould go down a little to the LT1 cam or what do you gyes think of this.
Maybee a 670 tb will do my cam justice,please feel free to comments this.
Thanks!!

 

With the cam profile you have installed, a 305 may not have enough displacement to make low RPM power. If you want more power at lower RPMs, you might want to change to a shorter duration cam. That will help with lower RPM power, but probably cause a loss of upper RPM power.

The cam profile you have listed isn't a complete mismatch, but may be just a bit large. If you have an automatic transmission, another option to improve acceleration would be to install a torque converter with a higher stall RPM.