Part of my other concern with that is I was thinking about the twin disk clutches. Unless they have a removeable weight then that would screw me there.
I'm no opposed to a high winding 355 either. Shifting over 7,000 is fun
And before you say it, planning on a 24x conversion too so factory ecu is not a limiting factor for rpm.
I was planning on studding the mains, from what I was reading it sounded like that was enough? I think I'd just try and find a factory 4 bolt block before I deal with aftermarket caps and line boring. That right there is like another $700 or so. Worst case I stick to one stage of juice and only whack it 150 horse or so instead of 250 lol.