Which pistons?

Right. Here's a bit more information about the car if it helps at all. The Barracuda is almost totally original, with the exception of an Edelbrock D4B intake and matching Edelbrock four barrel carb. It has electronic ignition, power steering, and newly installed front disc brakes with a power booster. Somewhere along the way it was converted from a three on the tree to a four on the floor.

I've kept and cleaned all of the original parts because it's something of an heirloom car. I'm the second owner, and I have all of the original receipts including the bill of sale. (Side note: The bill sale has a note from the salesman the owner struck a hard bargain: a side view mirror in exchange for the standard steering wheel, not the sport steering wheel.)

The car itself has about 110,000 miles. The main problem is that it sat for a long, long time in a garage before I bought it. Now it has a new interior, but nothing overwhelming.

Anyway, it's just not the kind of car that I really want to dig into and modify. I know that I could pop in a 318 or 340 for a lot cheaper than to rebuild the 273 as I want to, so my scope in the project is keep it looking original and at least keep the numbers all matching. I don't have any plans to sell the car, but I want to keep it reasonably true to itself.

I answer to Bill's questions, I'll never race it, there will never be turbos, supercharges, NO2, or anything exotic and I seriously doubt it will ever see 7,000 rpm. My understanding that 10.x compression would be ideal for the motor at 93 octane, which is what I feed it now, and that higher compression (11.x) would not be advisable. I do not intend to bore the cylinders unless it is necessary or easier to get pistons for a larger bore.

I'm certainly envious of hydraulic lifters, but I don't think I can justify putting in a Magnum engine just to have them.

I hope this helps.