Got the intake off of the C engine last night. Turning it over, only the valves of the first two cylinders move - broken cam. Are these non-interference engines? If I can replace the cam & bearings, the engine should be good to go again.
The rubber plug didn't work, interferred with the gasket. So, cleaned up the hole with brake cleaner and tried RTV again. Here'* the L engine ready for the C intake.
Discovered one other difference between the engines, won't affect me. The mount bolts between the engine and transmission case (not the bell housing). The C engine:
The L engine:
If you wanted to put a C engine in an L system, you'd either have to settle for two bolts, or have the 3rd one drilled & tapped.