Carb recommendations???

The biggest single improvement to the slant six engine, is to increase the compression ratio. As long as you stay within reasonable limits, there is absolutly no down side. It will improve torque, horsepower, and fuel milage. It is without question the best bang for the buck. It will also allow other modifactions to be more effetive. The problems arise with how much can you do, yourself, and "project creep". Milling the head is not expensive, in itself. But the labor to pay someone else the R&R the head adds a lot. Then the question arises "while the head is off, do I do a valve job", "should I do some porting", "should I install larger valves"? That is known as project creep.

My 64 Valiant has a 170 slant, with a milled head, a little bowl blending, but stock valves, 9.5 to 1 compression. Very, very mild cam. stock intake and exhaust manifold, 1bbl carb, 2 inch exhaust pipe, Electronic ignition with HEI. When running that much compression, recurving the distributer is required. I really can't remember the rear axle ratio (either 2.92 or 3.23). Three speed stick. This car is very peppy up to about 4,000 rpm, and gets upper 20's mpg. It does have some other mods that make slight imrovements, but for the average person not cost effective. It was bored and honed with a block plate, a small cut off the deck to make sure it was true. Rotating assy balanced.