IMO, 260@.050 with 9.5cr is "too much" cam..... Especially since its not a light weight vehicle.

Depending on what size the converter is, it either is or isn't a good candidate for loosening it enough to provide the desired increase in stall speed without loosing a bunch of efficiency.

I would say if its larger than a 9.5" unit, leave it alone and save fore a different one.

9.5cr, 260@.050, heavy vehicle...... Needs 4500 flash(minimum), which is going to be a fairly loose 9.5" behind that motor.

Looking at the specs, it appears you went from a xs274s up to a 306s Magum cam.
Not what you want to hear, but there would have been better options for a cam IMO.