350 does not want to idle correctly

[zap387]

Just got a new to me 78 camper special with a 350. It does not want to idle correctly it idles rough and shakes a little bit and sometimes stalls out. Someone poorly wired in an electric fuel pump and its pushing about 3.2 PSI for fuel. It does well revving but it wont idle well, it has a new Edelbrock 1406 600 carb. It has a single plane weiand 7546 intake and all new vac lines. I checked the vacuum and it bounces rapidly between 16 and 19 inches of mercury. According to all my research it looks like i might have worn valve guides, but i am not sure. I have some experience with LS stuff but this 70s small block is far off from what i usually work on. Any advice would be appreciated.