If you are going to put that 200 on your 78--you best beef up the transom. I have a 88 V-20 with the heavier 200HO and have now issues except I did have to put scupper covers over my rear scuppers in the transom--in off shore conditions it was bringing in to much water in reverse--so the covers worked great for me. The side scuppers are okay,,, the regular 200 probabley would have worked fine--but I wanted to be at the bottom of the HP range for the block used in the motor. If the motor comes with everything including the multifunction tach with all the gauges on it then that is not a bad price--you can probabley find a motor for less--offer less and see what they say--maybe 5900. As for letting them sit for awhile between usage--no problem for me so far--just use seafoam in your fuel to stabilize it and do not be afraid to use the winterization system as often as you want in between usage--only takes about 3 minutes to winterize.
Good luck with your choice.
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 88 V-20
200 G2
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