I will share what I did with a spare 318 I had when I blew up my motor last year.
Stock 78 318 long block
Summit K6901 cam
Stock valve springs but I should have changed them out.
Edelbrock Performer intake (LD4B if you can get one)
4150 Holley carb. I used a 750 but a 650 dp would be ok.
Stock 318 distributor with an FBO plate.
I stuck it in my Duster that already had Headers, dual 2.5" exhaust, H pipe, A-500 trans, 4.10 geared rear.
For what it is, I really am happy with it. It's a great way to make a stock 318 2bbl motor more fun!
Cley