my $0.02
swap in a std rebuilt L18 and TRX 5 speed, twin SUs and a lumpy cam.
L18s are SO much fun to drive compared to the L20s. and they take very kindly to a little bit of boost if you decide to later on.
don;t knock an FI Lseries until you've driven one, for very little money they go very, very hard.
the extra torque is....er...."fun"