STALLING IN GEAR

[SSDWD]

Hi Folks

I have a 1973 Pacemaker with twin Crusader 350's that were recently rebuilt
I can start them relatively easy and they idle perfect and rev great as well\

however when i put the port motor into gear it the engine stalls
I have tried the following:

*blew out the line to siphon valve
*new fuel filter
*some new plugs ,rest still looked ok
*checked for vacuum leak at carb
*adjusted jets and idle
*seafoam and water remover fresh gas
*new ignition coil

I can keep it running but have to rev it up too high and its too hard on tranny
any advice would be appreciated :

[cal40john]

Is the prop shaft free to turn by hand?

[SSDWD]

Yes I can turn the shaft by hand
forgot to mention that

[Cheechako]

Well, just real hard to say. Sounds like a carb issue to me. You may need a mechanic that's been around a long time.

[SSDWD]

got a guy coming tomorrow night
old carb expert hopefully its just that carb issue