feed all cylinders a mix of laquer thinner and atf in each cyl about a tsp a day each cyl for a couple weeks then try to turn the engine by hand, if it's free keep turning it. try cranking it with the plugs out and the coil disabled if the above works. then try a compression test. if that's respectable run it awhile until it warms up.then redo your comp test. if it's ok then your in business, you reallly don't have to worry about hurting this engine. it's either good or bad.charlie 38 bus cp