I've changed my mind as to what I'd like to do with my '68 Galaxie 500 with
302. The engine need a bottom end rebuild, so I was first thinking maybe I'd replace it with a stroked Windsor. Now I'm thinking I'd like to turn the car into a great highway cruiser and even more practical transportation. I'm thinking all-out mileage. It's already got the highway 2.80:1 rear end gears, so I was thinking I could swap the engine and transmission for a modern roller cam, fuel injected, computer controlled 5.0 with an AOD trans.What kind of work would be involved in this? The engine should just drop right in, but how about the transmission? Will it bolt right up? Does anything need to be done to the transmission crossmember? How does the size of the various automatic overdrive transmissions available for the 5.0 compare to the size of the FMX I've got in there now? Will I need a new driveshaft or to have mine shortened?
How does the computer fit into all of this? Will it need to be reprogrammed to be put into a '68? Is it worth it to have a computer and fuel injection over a carbureted engine with an overdrive transmission? What kind of drivability changes will I see with a fuel injected engine? How about mileage? The main idea of this is to see a good increase in mileage and max range with the car. It got about 17 MPG highway miles before it's engine trouble. On fueleconomy.gov I see 24-25 MPG for 5.0 Crown Vics, and even 27 MPG for one of the 4.6 engines. What's the deal with the 4.6 and is that a drop-in replacement like the 302? Anyway, I would be happy to have 25+ MPG. Are there any emissions stuff on these engines (EGR maybe?) that if removed would increase mileage? I assume that would be legal (I'm in NJ) since my car is a '68 model year and had practically no emissions controls.
Finally, where do I get the parts I need for this? I would prefer to keep this relatively cheap, but since the engine needs a rebuild anyway, I figure this is the time to do it. What engine and transmission out of what vehicle should I be looking for? What are my options and what parts would I need from the donor vehicle?
Thanks for all the information and advice you can give on this. I won't be doing anything with my '68 until next summer, but this idea just occurred to me as I was calculating the mileage on my '67 Galaxie the other day (got ~15 MPG... not too bad I suppose). I'd just like to research it a bit and decide how realistic and practical this is, perhaps keep my eyes open for donor parts. Thanks again.
Cory