Comp XE268H v Crow 18619 - 318

That's it right there! As in mild street and highway cruiser with decent performance that won't see the track. Heck, with the performance goals, any cam that isn't a stock two barrel piece will work.
Amaingly, this one is in stock here, but shipping to Oz is probably unfavorable at best.
Howards Cams, Rattler Retro-Fit Hydraulic Roller Camshaft, Chev SB LA, 227/235 @ .050, .525/.530, 109 LS - Competition Products