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Originally Posted by jerrylittle
Cannot tell you about the 305 I have a 98 5.7 good motor. The vortec came out in 96 so if you can get the vortec. Why? about 50 more horse power and it has more torque and has better gas mileage. So my suggestion is 96 and up.
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The Vortec has more power (although driving the two, there doesn't seem to be a big difference), but I will put my 1992 350 TBI up against any Vortec in gas mileage! Its a 4WD and it gets 18 mpg just driving it to work and on short trips (about 60 mile round trips).
As for teh 305 vs. 350, well my uncle had a couple 305s (one was a 95, one was a 96), and they both got bad gas mileage when compared to a 350, and of course had nowhere near the power as the 350 (even the Vortec 305s are rated with more HP then my TBI 350, but I have drove a Vortec 305 before and it doesn'teven compare to my TBI 350).
I would reccomend a 350 for sure (especially if you get a pre-96, the TBI 305s do'nt have much power, but the Vortec 305s are OK). You won't be dissappointed with a 350. They have more power AND get better gas mileage then the 351s Ford offered for those years.