Re: 1977 evinrude 70hp will not turn over - blown or what help?
Pull the plugs and see if it will turn over. Possible it coul dhave injested water and hydrolocked. This would be an extreme scenario, but is possible under the right conditions...
Otherwise, staart with the electrica basics, battery, starter, ignition control box and coils for spark, etc. Also, double check you fuel system to ensure you have not pinched the fuel line off somewhere and starved it out of fuel...