OK, I was thinking of building a 383 for my truck, but I've decided not to do so as this will probably be a daily driver for awhile.

My question is:

What's the best carb for gas mileage? I currently have a edelbrock performer 1400 on my 305 which is a 600 cfm carter clone. Should I go with a holley spreadbore? I'm not a big fan of q-jets just because they aren't really made new and as such parts that are subject to wear will be hard to find.

I plan on running vortec heads, 9.0:1 compression, edelbrock vortec manifolds, 350 block with stock crank and .030 pistons.

I've thought about getting some aftermarket fuel injection but a lot of it is like motorcycle fuel injection, premapped and doesn't remap on the fly like it does with factory fuel injection, which makes it too expensive.

Should I just stay with the edelbrock or is it worth picking up a spreadbore? I think the vortec manifold from edelbrock is a squarebore carb tho. Yikes, ideas?