LD4B

I went from a performer to a LD4B on my 318 and it was a night/day Improvment that work a 318 up.

yes it is sqaurebore only,high rise,duel plane,no *coil mount(runners reversed compaired to a LD340) I used a edelbrock 1405 600cfm with stock throttle/kickdown linkage.

I just removed it for a Holley STREET Dominator (small port 318 spredbore intake like a LD4B but low rise/single plane) with a holley 650cfm spredbore double pumper. and picked up a couple MPG.

another night/day change for my 85 stepside whiplash roller cam 5 speed daily driver.

I wont be going back to the eddy carb/LD4B any time soon after getting the holley carb/intake combo.

got the same results going to the holley STREET Dominator on the 440 truck with a edelbrock 1905 q-jet. works rather well for a low rise single pane intake on the street.

I would go with the LD4B if I had it. and look for the street dominator.