On a properly encapsulated deck, the deck covering is immaterial. I would run a snap-in carpet (easier to take out and clean or replace) and never hesitate
Sitting for 3 years, the stuff in the tank was reduced to goo
Did you clean out the tank after pumping it out? If not, the 25 gallons of fresh fuel just rehydrated the goo
The Amazon switches will fall apart after a while.
I would suggest Carling or Otto.
While Otto is the gold standard, Carling is the Sterling standard at 40% the cost
https://www.digikey.com/en/products/detail/carling-technologies/AV1-1A211E-R00/11587004
Depends on if it's direct drive or PMGR
Depends on if it's for a 153 tooth flywheel (straight across) or 168 tooth (staggered)
Depends if you are buying from GM or paying the markup thru Mercruiser, or from Arco, Remy, etc