What propeller for 25 Johnson 1988 ?

I have a Johnson 25 hp 1988 long shaft. I do not troll much and when I do I have a kicker motor for that. I need a all around prop and more concerned of full throttle Performance but do not want to over rev the engine either. How do I find the right prop I can buy on line and know it is correct. There is no dealer near me ( 125 miles ) and they will not give me any info on the phone as they want me to haul it in and make the big bucks. I can not find the pitch marked on the prop that was on there. Does anybody know what the manufactures recommended prop was originally? Thanks.