85 chevy 4x4 weak 350 help
 

i just bought 85 chevy 4x4 truck with 350 automatic it has 6in lift with 35's it has edelbrock 4brl carb when i crank it it seems to cam a little and has good throttle response but when i floor it in the mud it has trouble spinning the tires doesnt seem to miss but feels very weak it doent smoke or use oil any suggestions to getting power out of it is wat im trying to do. it has factory gears. thanks