Hey Scratch! wave I'm in the process of building a 273 for my 65 Barracuda, and will be using a set of 302 heads. Was it much of a big deal to step up the valve sizes to 1.88 - 1.60's? I'm not sure if the 273 needs that or not, but I'm open to it if it will help airflow and not hurt the velocity. It's gonna be .030 over with NORS 8.5 pistons, a D4B Edelbrock intake, MP electronic ignition. I'm using a 318 crank and bought new Scat rods cheaper than I could get the old ones redone! I'm leaning towards a Lunati retrofit hydraulic roller with 447 lift. There's another Lunati hydr roller that is slightly hotter, but I need to see what my builder says before I throw the money down. I'll be using Dougs headers in the Barracuda.
I had my 302 heads pressure checked to see if they were cracked, and they aren't. Those things are bad to crack between the valves