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The comment wasn't to suggested that it cant work but you need to start thinking about it. And i don't see there is a reason to simply change and copy the RHD design. Surely you want to change it to make...

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After all this effort id be getting a professional assessment of the bore geometry and likely a new rigid hone job would be in order, as those bores look very dark and therefore are likely worn

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I'd pull injectors and get them tested and go from there

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before you worry about the ITB you need the manifold to be aligned with the ports properly. The port axis is not perpendicular to the head flange.

you'll want individual return springs and...

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Runner length is normally determined based on peak hp rpm target with a 3rd harmonic , for an m20 about 12" from bellmouth to head flange is about right for a 7000 rpm engine (this is about 15"...

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are the bores tapered? the end gap needs to be checked at the area of minimum bore (on a used block it is normally where wear is lowest assuming it was done properly before)

The end gap is...

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Pretty much everyone assembles using a stand. Dont over think it...

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leaks there often, you need to put a some goop to seal the oil reurn holes. i have had ok luck retorqueing ARP to eliminate a similar leak on #1 but your bolts arent re-torquable.

If you...

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those look nice from that angle

i found this in my research incase someone wants https://soaraperformance.com/bmw-e30-m20-na-headers/...

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yes, its definitely just the viscosity damping things.