Carb + OffRoad = Q-Jet
For me Holly carbs are for cars and higher RPM applications (even if they say it is built for trucks).
I ran an Edelbrock 1902 Q-jet for years off road on my 350, for a carb had great performance. Did it hesitate and sometimes flood out or slosh..Yes
The Q-jet is hands down THE carb for off-road applications.
Nowa days I run a 454 with Edelbrock MPFI Pro-Flo EFI
WOW! Throttel responce is AMAZING compared to the carb and never do I ever have to worry about flooding out due to hills, bumpy roads or whatever I throw my truck at or into.
With your TH350 Tranny I would step up to 4.56 gears, you will loose Hwy but the torque to the ground will come in handy off road
.02c
Burt