Hi Frank,
Yes, thats a 86mm Scat billet crank.
About the seperate heads: Look at the porsches you mention: all 911 engines have individual heads. Look at the Scat split-port heads: also an individual head per cylinder.
All design choices have been made very conciously and all pro and cons were taken into account. Trust me on this one. Don't worry about it. It will be awesome
Best regards,
Walter