with wind or against wind
with current or against current
smooth water, or 1-2 foot chop
at idle speed, or wot
all of these things affect the fuel burn rate.
regarding your trip. bring along a bit of extra fuel
those cracks look like freeze damage. most likely the foam and wood under the fiberglass is saturated with water. hence the reason it never dries.
do a few test drills and core samples
your 470 has points ignition.
you will have to service the points, set dwell with a dwell meter, then set timing.
regarding the carb, my guess it needs to be gone thru.
Mandatory restoration reading in the stickies.
https://forums.iboats.com/threads/how-tos-and-other-great-information.283508/
read links 14, 15, 18, 13, 2, 3, 4a, and 4b (preferably in that order). look at tall the pics, watch all the how-to videos.
your starter has 4 connections
B terminal goes to the battery. this is a high-current power supply connection to the stater.
the Ground connection via the block. this is a high-current power supply connection to the starter
the S terminal which is energized by the crank position of the key...
It does require a thermostat
However the keed needs to be installed properly
What kit? What size HX (should be at least 5"in diameter and about 2 ft long)
Raw water pump is on front of motor. Replace the impeller and the raw water inlet fitting along with all the other maintenance the prior owner didn't do
You are running on muffs, correct? And not trying to suck up from bucket
