That's awsome! I'm dying to see how it turns out. Are you gonna be able to dyno it when your done? It'll be interesting to see how a decently flowing good compression 273 runs.
I posted this on another thread, but one of my favorite childhood memories was of my big brother taking me to a mopar only race and seeing a 1967 belvedere with 14" numbers on the fenders reading "273CI" eating big blocks in the quarter. I never got to talk to the driver or find out any specs, it looked like a trailer queen. I think I remember it running 10's! I'm sure it was a wild race only build and probabley running a LOT of nitrous, but DAMM it was cool!!!