I still believe the lz is not worth the effort. Mark got his normal l20b did efi and turbo on that and had great power on tap in his 180B. Simon knows this car too I think.

Turbo L series or just go z18.

Otherwise A series turbo will be fine.

One thing I believe and I spoke to Simon with is I don't care about power figures or totals. Drive ability tune and torque curve more important as these put a smile on your face.

On simons dyno mine only put out 50kw I think but it outs smile on my dial, now with Cam feels more easily need a tune again to check.

Depends if you want to chase figures or chase fun. From what you write I think you want more smiles less figures.