340 on pump gas

Solid cam! Why go with a hydraulic if you have the 273 rockers? Especially with 4.56 gears. Solid cam all the way.

I have a 340 with the MP .557 cam, single plane intake and 4.30:1 gears. Best car EVER on the street. Highway, not so much.

And yeah, might want to look into getting some head porting done.