elec fan-hp-gasmileage-edelbrock carb

[wade]

hi guys, does anyone have any thoughts on these items

iam thinking of either installing an electric rad fan or fan clutch on my 72 1500, or a flex fan. Iam looking for some increase in gas mileage and decrease in wind noise from the stock fan. I have been told that the stock fan can use up to 15-20 hp to drive at 5000 rpm. is this mod worth it? if so what size elec fan and where can I get one.

Iam also curious if anyone knows what the approx factory horse power was on the 1972 gmc 1500 with the 350 4 bbl carb?
I have a edelbrock intake and edelbrock 1405 carb, how much diff would that make?

I am considering installing 3 point seat belts, i have read most previous threads on this, but am wondering where exactly you mount the third point,or the shoulder portion. my 72 has what appears to be some plugs in the upper cab corner, is this where they would go?
there has been some mention that the edelbrock 1405 runs rich out of the box {manual chock} my truck does run great does not blow any black smoke, but it does seem to smell a little rich now and then. i also live at an altitude of 3500 asl, which would contribute to a richer mixture, what is the best way to tell if you are running rich? and if so, where are the metering rods at, how to change, and where to get.

lastly, what kind of fuel mileage can i expect out of this truck?
iam getting around 13 mpg but thats a canadian gallon which is
.75 of a litre larger then the us gallon, if around 13mpg per us gallon is kind of the standard, that means i should be getting around 15 or 16 on the canadian gallon, what is the best mileage this truck can get? once again, its a 350 4bbl 350 transmission,
iam thinking stock 307 gears but iam not sure 1500 gmc super custom 1/2 ton

thanks!!!!!!!