The Voodoo 700 or 701 should work here, also. 701 being the max here [maybe even too big here], with this low compress 350.
https://www.lunatipower.com/voodoo-h...8-250-256.html
https://www.lunatipower.com/voodoo-h...8-256-262.html
The 4 speed and 3.08 gears might save you here with the 701. Most folks try to cam these low compress 350`s with auto trans with stock stall and 2.41 to 2.78 gears.