273ci thoughts?

Talk to Hughs to coordinate cam and piston choice. Are you going to balance the engine? If so Magnum pistons might be a good choice, higher compression ratio and narrower rings? What octane gas are you willing to buy and what is available where you will be driving?
Magnum pistons wont fit an LA rod. The magnum rods had a .100 ish narrower little end as did the pistons. I bought a set of magnum stroker pistons and had to clearance the pistons to fit the LA rod little ends. It was a small difference but they didnt fit OOTB.