1968 125 hp merc Need knowledgeable help

I am looking to buy merc 125-

I am looking to buy merc 125-hp 1968.
It has being parked for almost a year.
I am assured it is in good condition.
What should i do to check motor before i buy.
If in good condition What would be reasonable price to pay?
Would like several opinions on this motors.

Very Thankful
to those knowledgeable
and willing to help!!!
Danner

check compression (they s

check compression (they should be even) and replace the water pump impeller if you buy the motor.You replacee the impeller because the motor does not have an overheat warning system.

" Thank You soooo much!! Spark

" Thank You soooo much!! Sparky
Every little bit of advise helps.
I don't know much about outboard engines.
If there was a book that would teach me step by step I would just learn and maintain my own motor.But someone told me about clymers books,I bought one but it is simply to vague to follow.
I hold YOU in high regard and respect your words.
my johnson 140 developed a knock and it cost too much to rebulid. bring retired and on fixed income this 1968 is all I can afford!
I THANK YOU very much.
Your Friend
Danner "

" Be aware that MERCURY motors

" Be aware that MERCURY motors did not use stainless shafts untill the late 70's ( OMC has been stainless since at least 1950), so a cosmetic gem might still be a headache.Your best bet might be to find a used powerhead or a good shop to repair the 140 OMC "