273, or 318?

I’ve got my 273 torn apart, and need to decide which way to go. All original engine. Crank and rods are fine. One cylinder won’t clean, so it will need bored. Do I stick with 4bbl pistons, or by 318 pistons like kb167? It would bring compression down about a point or so, the way it’s sounding.
I plan on running 3.73 gears and putting in an A500 overdrive. Try to stay with like the Isky E4 cam. I want to make an all around good driver, not just a drag car! All opinions welcome.
You can't interchange 318 pistons in 273's. If you need to bore the block get ahold of Egge Machine for the right pistons. Keep the Isky E4. It is a good one.