My new-to-me 1970 C-model showed the obvious signs of weak engine mount isolators (Lord Mounts).  The prop sagged over an inch below the cowl opening.  It was time to tackle the task of changing the engine mounts.   In case anyone else needs to do this job I thought I'd share some info.  There are multiple ways to do this job.  I describe what worked for me. The Lord mounts for a C-model cost about $450 a set.  Access is very tight but do-able.  I removed some intake parts, scat tubing