"FMX's have a problem with the pressure valve sticking in the pump. It's due from lack of fluid changes. If all else is ok, you can drive it that way but it will need a rebuild soon."
The pressure regulator valve train in the FMX is located in the valve body. The best way to check for any...
Usual cause of this issue is too long a time in the carb dip, or possibly the modern fuels affecting the "O" ring. I've fixed it in the past by removing the plug, threading the hole and using a shallow plug. Have also plugged the holes the fuel transfer tube goes into, and made the carbs a dual...
I'm going to assume that the reverse valve body was a full manual type. In most instances, the governor circuits in the case, or the governor itself would have been modified. Perhaps the governor valve is sticking. What did your trans shop have to do to swap in the conventional valve body? What...
Welcome from Prince Edward Island, Canada!!
Hope your plans for this car work out for you.
Would you happen to know of any '71-'73 Mach1 project cars in your area that the owner has lost interest in?
I machined an adapter once to use a late 70s Olds Quadra-jet. Not a direct fit but it worked very, very well. How much do you want for your current 4300D?