I am putting a 1984 305 in a 1978

the 84 305 got the carb with the wires so i have to change it

do i have to change Distributor also? someone told me to run a wire to the fusebox someway and it would work

Someone told you wrong. You need a non-computer carb and a vacuum advance distributor. The advance of the '84 distributor is controlled by a computer with info from engine sensors. Just hooking it up to 12 volts is doing nothing. Same for the carb.

Doug

So i need like a 500 or 600 cfm carb and a HEI vacuum advance distributor.

Do i also have to change the intake?

So i need like a 500 or 600 cfm carb and a HEI vacuum advance distributor.

Do i also have to change the intake?

Do you have a carb off of the '78? If you do and it's for a V8, use it. If you need to buy a carb, I personally would look for a pre-computer Rochester 4V. The intake manifold I believe takes a spread-bore base carb. There are after-market carbs with this base and also adapters.

Doug

no i dont have the 78 carb..i got the car with no motor in it

The intake manifold spread-bore base carb??

The 1984 intake manifold??? is spread-bore base carb??


a pre-computer Rochester 4V will go on the 1984 intake manifold???

also what about the EGR?

The '84 intake is for a spread bore 4 barrel carburetor ( 4V stands for 4 barrel) Rochester Quadrajet carburetors have the spread bore design. The secondary openings are larger than the primaries. The other base design is called a square base. The secondaries and the primaries are the same size. A square base carburetor can be used on the '84 intake with an adapter.
And yeah, a pre-computer Rochester carb will fit the '84 intake.

The idea behind the spread bore is too give you better gas mileage when cruising on the small primaries and still having an overall large CFM when you open all 4 venturies.


Look at this site,
http://www.wpsracing.com/cpprcaad.html

Also type in "spread bore carburetors" on Google.

Doug

You could check into an aftermarket MSD or Mallory HEI non vaccume advance Distirbutor, just to name a couple. Very simple install, not much cash, and it would be NEW without possible worn parts. Just another option you may want to explore.
http://i300.photobucket.com/albums/nn18/coyoteon2/BlownRear.jpghttp://i300.photobucket.com/albums/nn18/coyoteon2/RBSCOOP.jpghttp://i300.photobucket.com/albums/nn18/coyoteon2/AMW_edited.jpg

Will this one below work? Its on ebay and he says its been rebuilt and is off a 1978 Chevy truck

http://i22.ebayimg.com/06/i/001/0b/67/f843_1.JPG

Yes, looks like it's missing the fuel filter housing (nut). That's the part that screws into the carb fuel inlet and holds the fuel filter. The fuel line screws into the fuel filter housing.

Doug