Had a weber on a car before, it was an improvement but on a 318 I wouldn't do one. On my old jeep 4.2 I went and put on a holley 2bbl carb off of a mid 60's jeep. Holley 2300 series. Those are the ones that are basically the front half of a holley 4bbl carb. They are simple and use the same tuning parts as a 4bbl. That would be my choice if you don't want to go 4bbl.