Nick's Garage dyno's a 318 Stroker.

I'm going to be running a 318 with 273 heads... good compression. I have an Erson "rv" cam which has a decent lift, but not over the .500 that people usual search for. I'm running it on the street. It's all low end power. TTi headers, street dominator manifold, 3.55 gear, and best of all it's a stick.

Would a 340 or a 360 be better? Sure. Like they say, there's no replacement for displacement. But I won't be disappointed. Heck, I haven't even started this one and I'm already looking into building a stroker 318. It never ends...
a little 318, 0.040" over, with a 4" arm will get you a 392 WEDGE.
Oh, yeah I forgot to mention. I just picked up an ultrasonic thickness tester (Made in the USA) for $5 at the Mare Island Museum liquidation. So much stuff at great prices. They even have a Pratt & Whitney lathe 16"x54". I didn't want to ask the price because I have nowhere to put it. Anyone in the bay area interested? The museum is open on Wednesdays.