you have to get the engine manuals from Mercruiser. http://publications.brunswick.com/
regarding your motor, 4600-4800 RPM. However I would not have a problem turning that motor 5000 RPM
First, welcome aboard
then at the top of the forum are some "stickies" threads that are permanently "stuck" to the top.
4th sticky down, go thru links 14, 15, 18, 2, 3, 4a, and 4b in their entirety.
you still need a drive. the 2.3 liter has the wrong gearing for a 5.0. plus you need the correct transom assembly.
you need to change everything from the front pulley to the propeller
yes, however you would need a complete 5.0, and appropriate drive to replace everything pulley to prop.
the 2.3 was used almost 40 years ago. is the boat structurally sound enough for a repower?
GM 12609190
interchange numbers 12568878, 888775T, 879312003, 12609192
here is one for under $100
https://www.ebay.com/itm/165294608533
here is one for about $50 https://www.ebay.com/itm/144380439774
$100 as wall art
If it's running perfect.....$300-$400 to that one guy, $200-$300 to everyone else
24:1 motor, pressure tank, most likely needing coils and crank seal
I would list it on AOMCI