290hp slant you tube Video

Hyper_pak said

Someone made a post about there being something wrong with this engine on the video and during the adjustments. Of course I can't find it now, jus curious if anyone saw an issue with the build? I contacted the video guy about the carb jettings, but no response yet.

Click to expand...

Seems like a pretty nice combo to me, headers would have helped.
If you have a decent cam & compression ratio I would start with the following as a base line:
Chokes - 38mm (36mm if milder motor)
Auxiliary venturis - 4.5
Pump spill valve - 00 (no bypass)
Needle & seat - 250 (200 if milder lower rpm motor)
Float level - 7.5mm (brass floats)
Emulsion tubes- F2 (try F16s first if that is what you have - these get pretty expensive to swap out)
Mains - 145 (140 with 36mm chokes)
Air correctors - 180
idle jets - 55F9 or 50F9 (carb body model/progression hole size, number of holes and placement will impact this a bit)
Accelerator pump jets - 50