early tranny questions(63Falcon)

I picked up a 63 Falcon wagon recently, has a 260 and 2 speed automatic, 2.70 rear gear. I am getting crappy gas mileage in toen because it shifts into 2nd at 45 mph. Most streets in town are 30-40 mph. I cruise at high rpms. I waas thinging of swapping in a c4 to make it more economical. My question is, can I use the 2speed bellhousing with a later year c4 tranny? I know the earlier engine blocks were 5 bolt vs. 6 bolt. So I'm thinking if I keek the 5 bolt bell the c4 might bolt up to it. I know not to just unbolt the bell from an auto tranny. Any tips, ideas, advice would be apreciated. And the ocassional funny guy. Thanks in advance.

rbohm said:

as far as i know the 2 spd tranny bell will not bolt to a C4. your best bet would be to find a 289 or 302 witha 6 bolt bell and swap in that motor along with a C4 or AOD tranny in place of the old 2spd and 260. that is unless you really want to keep the 260.

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I was afraid of that.

I am getting 18 mpg in the Stang with a 351w, 5 speed and 3.50 rear gear. But I recently moved to Ohio where they salt the roads in the winter. I bought the falcon hoping for more economy, but its getting around 10mpg on a 2bbl carb because of the 2 speed auto. The car is a daily driver.