When I buy a new truck hopefully soon. I want a 3/4 ton with either a 350 or 351 what engine has the best pulling power. The Chevy 350 will be the vortec. Another question I have a 1991 GMC 4.3 litre. I think it was in 1995 when they made it with vortec giving it an extra (30) horsepower I think. For anyone that has driven and pulled with both 4.3 and 4.3 with vortec is there a big difference When pulling a trailer? Does the Fords 4.9 inline 6 have better pulling power than the 4.3 vortec?