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Probably 1/2". I would switch to PVC board

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

Check the anti-siphon valve

I use this https://www.amazon.com/Mityvac-MITMV8500-Silverline-Automotive-Vacuum/dp/B0002SQYUA

What trouble shooting steps? Did you check the anti-siphon valve? Did you check the pickup tube?

I would buy a new filler, and drill new holes in either the boat or the filler neck flange

Could be a bunch of issues. What trouble shooting steps have you done?

And what does this have to go with the OPs thread?

If there is no rot, then it's good. However most old fiberglass boats need a hull restoration

And Holley has a 10% discount if you want their emails

You may want to do some reading on design life vs service life. https://forums.iboats.com/threads/perspective-of-fiberglass-boat-design-life.683703/

And where in the add does it state what it is other than a 4160 which is available in 390 to 750 CFM

If it makes you sleep better.

Stickers go on the tool box

I usually order from summit racing, however the last 5-6 carbs have been craigslist or facetube marketplace and I refurbished them for about 1/5th the cost of new. Holley usually has sales on factory refurbished carbs on their site that will save you 25% over new Not sure what carb they have...

wood is rotted in the transom. surprised you didnt have issues about 10 years ago. its a weekend job and you will need access to someone that can weld aluminum and you will need to pull the motor

Welcome aboard have you taken a digital multi meter and did any troubleshooting? could be bad relays, could be broken wire, could be bad switch in handle.

I do this as a hobby, professionals get paid..... LOL you are dealing with cast pistons. so weight is all over the place. if youre not going to spin that motor over the published 4600 RPM range, no need to worry about it. especially since you have cast pistons if you are going for an 8000...

each boat is different. the cradles I have built are simply plywood and 2x4's cut the plywood to fit the hull every few feet, strengthen with 2x4's I have also built a cradle on the trailer once. a few 2x4's across the trailer, pizza slice shapped plywood bits to go up to the hull. take...

they are push-to-connect fittings and yes, the pump will hammer a bit at low flow as it is building pressure, and being turned off by the pressure switch, then loosing pressure because you have the sink running turn the faucet/tap on full and the pump just runs.