Why not build a 340?

Since this is street engine with lower gearing, then go for better torque and a wider torque band. Keep the SCR up above 9. Just a quick exercise:
- 318 head, open chambers of 66 cc with milling
- .051 standard Felpro head gaskets
- KB243 pistons with standard deck height, .030" overbore
- SCR = 9.1

Change head gaskets to .039 Felpro 1008's, and your at 9.3.

It won't be as hard as I thought to keep the CR up around 9 with the larger 360 type heads with nominal 72 cc combustion chambers. And you can always mill them .030" or so and stay well above 9.

BTW the Speed Pro L2316F's are probably a better budget choice as they are close to stock weights for piston & pin and so won't require a crank rebalance.