Only three engines worth having from the range, the M42B18, M20B25 (or the 2.7 Alpina) and the S14 or a stroker M20 (custom)
the M40 (1.6 and 1.8) are just far too under powered, but can be built to take boost
The M20B20 is 1.8 power with 2.5 fuel economy, though with a little fettling can be...