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why did you start a second thread on the same topic?

not going to lie, the 470 looked good on paper, then the execution fell down... the cylinder head should have been aluminum, the block should have had a closed deck, the heat exchanger should have bee larger to begin with.

right next to your fuel fill

Or your fuel vent is clogged, which would explain the duration of time (the 1 to 1.5 hours you mention)

I would think a #65 power valve would be a bit rich until the RPM's came up

the R75007 is the list number Here is the Holley list. https://documents.holley.com/techlibrary_carb_numerical_listing.pdf

what is the holley list number on the air horn

c'mon, the Chrysler products often had AFB's...... some of us ran dual quads (small 600 CFM carters on a dual quad manifold on a 383) and then some of us did stupid things with a pair of 500 CFM holley 2300's and two turbochargers on a 4.3, then when it blew, we moved the setup to a stock Big...

assuming you have the NMEA gateways, etc.

the carb motor curve will have a higher peak to the torque curve vs the EFI having a flatter curve. this is partially because the cam LSA changes for the induction (reference the Mercruiser HP500 in both carb and EFI.... same HP rating at WOT, slightly different torque curves) the EFI motor has...

there is no debate, not sure why you are coming across as confrontational wireing depends on the alternator you have. Delco, Mando, etc. however there should be at a minimum, the ground cable, the battery charge cable and an excite cable from the ignition (usually purple). you will need to...

first, the seloc manual has more mis-information and wrong information than correct information. what does the factory manual say? second, so you have smartcraft...... however the only gauge shown on your dash that would be smartcraft is still only the tach. and since you dont have a digital...

or simply spend $8 on a new power valve. ($11 on amazon if you want it tomorrow)

there are no quick fixes for fadef clear. Your boat was intended to last 15 years and be replaced. Most likely you are into a re-paint or re-gel

Use a zip tie and tie off the filter to the alternator

There are about 30 spring configurations and about 20 variations of ratings . So replace what you have with the exact sames style, rating and configuration

Not if you leave the motor lowered. Only if you tip it up can water pool in the lower and then freeze

points ignition and carb used to be part of IC engines 101. they quit teaching that about 4 years ago. todays "ASE certified mechanics" learn less in year one than a 1985 high school kid in Autos class.

the raw water pump came on the engine from GM. its a GM marine pump that fits the 153 (2.5 liter), 181 (3.0 liter) or the 250 cubic inch (4.1 liter) make sure to service your points come spring.

2 barrel or 4 barrel? or 2300 or 4150/4160? you payed way too much for a $35 holley rebuild kit replace with same power valve that was in there. soak the main body and the metering block(s) in carb cleaner, then chase each passage with a fine wire or fishing line, then blow out with spray can...