Hi Rcimp, if none of the above suggestions work, I wouldn't necessarily trust your fuel pump just because it is new. A few months ago I put a new one my 235 and it ran great for about 30 miles. Then for some reason it would no longer pump enough fuel when the engine was at cruising speed. But it would pump enough at an idle. So I went and put an old pump on and everything was fine. Also, don't forget to check the condensor. Good Luck.

1948 Chevy 6400
1964 Chevy 1/2 Ton