[GARRICK.CLARK]

I had a euro race H grind in a 1776 which was perfect for the size of engine. So your K is too much for an 1835 motor. They don't make euro race H of K grinds any more. The 1 built was over 30 years ago. Type 4 version are still available. Might be old stock though.
An Engle 120 on an 1835 with dual 40 dells will idle smooth

 

[GARRICK.CLARK]

Yeah. There's loads of old cam names and configurations for aircooled motors where the info just doesn't get logged on the net. Your cam might be over 30 years old. A cc increase would help it.