Looking for the right path!

I'd go for a feeling rather than a number, and here's the way I'd go to get your goal:

While engine is out of the car, check bore wear. If acceptable, reassemble with new bearings, timing chain, and camshaft of your choice - something mild in the 1500 ~ 5500rpm range or thereabouts.

If the bores are worn, add new pistons and rings to the above, as well bore machining to suit. Hypereutectic pistons are great for performance street use as they are strong, not temperamental when cold and not too expensive either; a great middleground between regular ol' cast units and top-o-tha-line forged ones.

Slap on a carby around 600 ~ 650cfm and call it a day!

- boingk