I agree CAs have their place for easy hp but they arent the prettiest of engines if you care for that matter. For me they are a pretty ugly looking thing with their factory manifolding and separate square boxy rocker covers. Its like a square sharp edged engine in a coke bottle car that deserves more curves for its heart.

L20B all the way but with Z22E pistons and Z20E rods makes them rev like an L16.

Z22E rods 152.5mm pistons 32.1mm comp height 87mm diameter
Rod stroke ratio 1.773

L20B rods 145.9mm pistons 38.1mm comp height maybe 40grams more
Rod stroke ratio 1.697

The 2045cc is a common combo w/ L series crowd almost 100cc extra