I don't know how much mony you want to put out, but I would get a crate motor for it. Good power, good mileage, and VERY reliable. It will turn an old type car into a very nice car. It's the way to go if you ask me.

 

carburetor size is about rpm as much as cubic inch ,and the the 289 is a high revin little motor. i stick by the 600 if you rev to 6500-7000 as i woud.i like mechanical secondaries ....as they are adjustable. if set right ,they are mean as hell.dont go too mild ,as i did you wont be satisfied !! do it now and dont look back. my car has a 350 in it and lifts left wheel... i love it !!!! 1.78 60ft. I LOVE ACCELERATION!!! dont care about top speed . pinned in the seat is for me!!! GOOD LUCK!!

 

Ain't no way he's gonna get 6.5-7k out of a stock engine with just an aftermarket ignition, carb and duel exhaust. The valvetrain won't do it.