i have a 1971 350 small block engine...all stock pretty much ... what are some small things i can add for more hp and torque little by little...and some big things too...from 0$-500$ what can i buy ... list as much as possible .... and 1 question ... if my transmission doesnt shift all smooth ... it like revs higher then shifts and jerks u ... is it like some sort of racing transmission or something because isnt it suppost to be smooth?