Volvo Repair: Fuel System on 1978 VOLVO 262C BERTONE V6, litre conversion, carburetor system

Question
I HAVE A 1978 VOLVO 262C BERTONE WITH THE V6 ENGINE THAT ONLY HAS 75K MILES ON THE ENGINE.  I AM THE SECOND OWNER OF THIS CAR AND NOISEWISE THE ENGINE RUNS SMOOTHLY, HOWEVER; RECENTLY IT HAS DEVELOPED A PROBLEM WITH ACCELERATION OFF THE LINE.  IT APPEARS THAT THERE IS NO VACUMN GETTING TO THE VACUUM ADVANCE OF THE DISTRIBUTOR.  I TOOK THE VEHICLE TO A LOCAL VERY KNOWLEDGEBLE VOLVO MECHANIC AND HE SAID THAT THE FUEL INJECTION SYSTEM ON THAT CAR 'IS JUNK' AND WILL GIVE ME NOTHING BUT HEADACHES IN THE FUTURE.  HE SUGGESTED THAT I LOOK FOR A INTAKE MANIFOLD AND CARBURETOR OFF A 1976/77 VOLVO V6 AND CONVERT IT BACK TO A CARBURETOR SYSTEM.  ANOTHER SUGGESTION IS TO JUNK THE WHOLE ENGINE/TRANSMISSION AND HAVE THE MUSTANG 5.0 LITRE CONVERSION DONE ON THE CAR.  THE EXPERT HERE SAID THAT THE ENGINE IS STRONG BUT THE FUEL SYSTEM IS 'JUNK'.  IN YOUR OPINION, WHAT SHOULD I DO TO MAKE THIS CAR A GOOD DEPENDABLE (BUT FINANCIALLY VIABLE) CAR FOR FUTURE USE.  I ALSO THINK THAT THE TRANSMISSION MAY NEED SOME MINOR MAINTENANCE WORK IN THE NEAR FUTURE.

Answer
The V6 volvo got a bad reputation due to high maintenance costs. The camshafts would wear out due to lack of oil changes, so be sure to change oil frequently or better yet, use synthetic oil. These engines can run upwards of 200,000 miles.
The fuel injection system is no problem and easy to work on, typical Bosch CIS system which is very reliable. This system has been around for many years on many makes of cars from MB to VW. As far as his suggestion about intake and carburetor, I don't know of any Volvo V6 with a carburetor ever.
The conversion to a mustang system has been done, but why?
This is usually done by hot-rodders for fun.

I would get another opinion from another Volvo mechanic.

As far as your initial question about the vacuum signal to distributor, the hose probably just fell off or broke. The hose is routed around and under the intake..get a diagram and follow it.