My 2c on the 20/22 R. For the street the 20R is best for all around power. Put a set of 22R pistons in it and have a ball, but the bottom of the powerband is not as torque as the 22R. The 22R has a better torque band from idle to about 2000rpm, a lot of grunt for crawlin'. Either engine will respond to a properly tuned downdraft weber. The 22R is easier to convert to EFI. Personally I like a 20/22R hybrid with a mild port job and bigger valves. With the right cam and tune you can make a stump puller. FYI the 20R head will bolt to an early 22r block (pre '85) with no mods and attain a higher compression ratio still street usable. The later block ('85 and later) can use the 20R head, but the compression drops of to turbo levels and the cam timing advances too far to be useable. To remedy, machine work has to be done to lower the cam height to head deck and the oil passage has to be recut, a lot of work to put the 20R on the late 22R block. I've gone too far, again. But both engine are good, but have different personalities. Just gotta figure out wich girl is right for you.