From what I can remember the "Hi-Cam" engines are absolutely identical to the earlier 4Ks. The Hi-Cam moniker was just a marketing ploy to try and con people into buying the KE70 even though it was still pushrod. As for bolt-on options, a Nikki carby bolts straight on with a little modification, for some small gains (I've got one but haven't gotten around to rebuilding it and installing it on Billie). Plenty of other ones should fit (pretty standard bolt pattern), best place to look is in the Rollaclub FAQ
THIS should help out a bit, if it wants you to sign into Rollaclub just tell me and I'll post up the guts of it.
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