I suggest to start a list of "what cured what", if there isn't already one. This will be beneficial to all of us especially us relatively new members. It could cover all red-block engine related issues (240, 740, 940).

A Volvo believer:
1) The new Bosch coil cured my poor acceleration.
2) Changing from my #561 computer to a used #951 computer solved my poor hot start since the 951 pre-primes the fuel line when you turn the key to "on."
3) The new catalytic converter was the only new part that finally made it pass emission testing.

Erwin:
4) Replacing RSR cured my intermittent non-start and mysterious 232 code
5) Broken shot thermostat overheated my engine. Solution: coolant level alarm.