im seeing both sides of the table here. if we are giving opinions - heres mine haha

not a fan of LPG (my opinion) its like a carb, efi is king

Lseries turbo are underrated and will give you plenty of power, regardless of what head you use. zhead will help keep height down which is important in a 1000 but not so much in the 1200

a15 efi turbo is also an underrated thing and will give you your lightweightness

you pretty much need to determine your goals. lightweight? power? fuel efficiency? cost?

anthony morrows car is a squillion dollar highly developed nizpro motor, so cant really use it as an example.

also keep in mind that all the machining might sound cheap, but if you can;t screw it together yourself you'll be up for more, plus bearings, rings, gaskets, oils....

so whats the point of this thread again? haha