273 2bbl turn into Commando or is 318 better?

340's are too hard to find and therefore too expensive here.
318's are easier to get pistons etc than a 273

If the slant is in good condition, a 2 barrel, exhaust, and electronic ignition.
Use a 4 speed from a VH onwards, they will fit the standard bell housing with mods.
Will be nice to drive and good on fuel.
Todd from Tamworth with the gold AP6 ute has this set up, very nice.