How bad is this tire/gear combo killing me??

i am running a 275/60/15 on a 15x10 rim with a 2.91 rear and i can burn em off all day long. i have a 727 and when i get on it, that puppy pulls. maybe our definitions of a dog may be different, but my duster will get it. maybe carburetion.i just re- read and saw it is a four speed.