/6...318...or 360???

Try to find a factory 318 4BBL.
These engines are great.
You can find them in cop cars or wagons usually.
They come with a 360 intake, 340 sixpak cam, 340 connecting rods, 360 heads milled to maintain compression, dual roller timing chain, usually have a thermoquad or quadrajet depending on the year.


It's a strong little motor that gets good gas mileage and can run 87 octane.
I upgraded the one I found, and put it in my duster.
The only thing I noticed bad about it is that the aggressive stock cam will sometimes not provide enough vacuum if you have power brakes.