273, or 318?

not pistons, that's for sure. sealed power flat tops? 50 bux more for cast even! aftermarket or forged? easily X3
Partly why I keep to the General and Ford. Mind you, I am.keeping an eye on a Challenger sitting in the bush. Belongs to the guys brother in law. Some stuff like the dash not original and the engine. But if a person wants a good looking car to enjoy driving, what the heck.
One project in the pipeline is a '40 Chev Coupe. I want to put a pressure lube 235 crank in and bore it a bit. Fill, port and mill the head. Get new con rods and pistons for it. Maybe run three SU or Stromberg CD carbs with a bit snotty cam. Run a T5 transmission. That will run into some pricey parts on an 80 year old water heater stovebolt.