Also remember that the 1979 Civic is not going to have a high pressure fuel system to run EFI. This can be quite a pain in the butt to deal with even on something like a 1986 CRX, which DOES have the SI varient from which to swap the fuel system. But since NO 1G Civic EVER had EFI, this is going to ave to be 100% custom.
That's a good point, I should have mentioned that it's a '90 HF so the swap is even easier. Basically I'm wondering if the .29 cd of the HF will make up for the added weight. I do a lot of highway driving so I'm shooting for over 50MPG combined.
Weight close to the '79 with better aero and (relatively) easy swap. Low pressure fuel would have to be addressed, however.
A 1G CRX would not be a bad choice. After all, the fuel issues can be taken care of by swapping parts from the 1G SI. But is one other issue to contend with. One is wiring. The wiring changes wil be VERY extensive, as this car has no wiring for EFI. Furthermore, all of the wiring will have to be custom, as there are no wiring kits for this swap. And if you have to pay someone else to do it, I hope you have LOTS of cash.
Then, of course, there is the transmission to deal with. Strictly speaking, this is not much of an issue, since a 1G Integra transmission can be used with little problem. BUT, I am assuming that you are doing this swap to get better fuel economy. And if this is the case, the Integra transmission is rather short. If you want to use, say, a 2G CRX HF transmission, there will be mountng issues. Specifically, there are no mounts available to make this a bolt-in swap. Unless you can weld/fabricate, or pay someone else to do so, this is just not going to work.
My thoughts? This seems like an awful lot of trouble to save ~100 pounds (compared to a 2G HF).