318 stroker
At what compression ratio Craig?
A 10-1 ratio would be a 72 cc head and a .054 gasket with the slug down .125. Food for thought.
In this configuration and open exhaust, a Comp cam around 280 advertised duration w/.480 lift would make something like 355+ hp at a low 5500 RPM with mounds of torque. Most probably 400+ lbs. from idle to 4500.
If you get a good porting done on the head, which should be equal to and a lot cheaper than Edelbrock heads, you'll gain a good 40 HP+ and torque. It would be about 1 hp & lbs. per cube. I myself would also run a 1.6 rocker. (.512 gross lift, you'll net a slight less)
And IMO, you could still use more head.
I certainly would not worry about valve shrouding. If I was racing, well, yea, there is a reason they un shroud valves in race engines. However, Chevy never worried about it and the current engines are excellent power makers. The 5.7 HEMI has a small bore. In fact, it's just like someone's 349 above.
Hummmmmmmmmmmmmmmmm