I'v got a weber on my single barrel intake. I'm gonna get a two barrel intake off an amc eagle. Will I need an adaptor to goto the two barrel intake or will my carb bolt up. This is on a 1974, 258

Yes. Call Redline.

I modified a diferent one to work.

make sure you get a fuel regulator. jeeps put out 7 psi and your weber can only handle 3psi. trust my I blew mine in the first year not knowing.