I second this opinion; the B20 also has a mounting ear for an alternator, and the extra torque is nice.
If you want a bit more power use the factory 8.7/1 fuel-injected head with the injector holes plugged and the factory fuel injected cam. Use the dual outlet exhaust manifold. These changes will make the car nice and peppy but still very smooth for daily driving, and you can use regular gas. Use a richer needle in the SU's to take advantage of the extra displacement.

I didn't notice any fuel economy loss with the larger motor, unless I drove really aggressively. You'll be glad for the extra power when you're trying to merge onto the freeway.

Bill