I realize I may be comparing apples to oranges, but I went thru a frustrating experience with a Honda Accord(R-12) about 4 yrs. ago.
Local shop told me everything needed to be replaced - $1500-$2000.
You mention the clutch doesn't engage. In my case, the system was dry due to a faulty low pressure switch. $45 for a new switch, $20 for a 609 cert. and 2 cans of juice and I was back on the road. 4 yrs. later, it blows 36F out the center vents on an upper 80's - low 90's day.
Do a little digging/studying before you unload your wallet.
My 2 cents.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.